Do not code replacement therapy as treatment . Most papillary thyroid cancers occur in individuals without a family history of thyroid cancer (sporadic thyroid cancer). Based on evidence accumulated over the past three decades showing that noninvasive encapsulated follicular variant of papillary thyroid carcinoma has an indolent clinical behavior and a RAS-like molecular profile similar to follicular adenoma, the Endocrine Pathology Society working group in 2016 proposed to rename this entity as. Although most. variant of papillary thyroid carcinoma on rates of malignancy for fine-needle. C15. poorly differentiated thyroid carcinoma (pdtc) is malignant neoplasm of follicular cell origin showing intermediate histopathological patterns between differentiated and undifferentiated thyroid cancers. 6 may differ. Small, localized PTCs accounted for most of the increase, largely reflecting the more. (Sequence correctly. 0 - other international versions of ICD-10 D44. Tumours of the thyroid gland ICD 0 codes. Many reoperations for papillary thyroid carcinoma are for management of persistent disease. Z85. Papillary thyroid cancer (PTC) is a type of cancer that develops on the thyroid gland. 6 mm and showing an indistinct border can be seen in the right lobe of. 0): 374. Endocrine, nutritional and metabolic diseases complicating pregnancy, unspecified trimester. BACKGROUND. Short description: HX OF THYROID MALIGNANCY. Thyroid Gland C739 . 850 is exempt from POA reporting ( Present On Admission). C50. Predominant form of thyroid carcinoma, accounting for 80 - 93% in contemporary series (IARC: CI5 Cancer Incidence in Five Continents [Accessed 30 September 2019]) There is a growing number of papillary thyroid carcinoma in the last 15 - 20 years due to increasing recognition of thyroid nodules on imaging (ultrasound and CT), sometimes referred as thyroid cancer epidemics; most of these tumors. It usually has an excellent prognosis and treatment, most commonly surgery, and is often successful. Crossref , Medline , Google ScholarBackground: Poorly differentiated thyroid cancer (PDTC) is a rare but clinically highly significant entity because it accounts for most fatalities from non-anaplastic follicular cell-derived thyroid cancer. ICD-10-CM Code. The prognosis is better for people who are younger than 40 and for those with smaller tumors. 0 : Benign neoplasm of parotid gland [Warthin’s tumor] N80. ) Colitis due to Clostridium difficile, specified as to recurrent. The 2024 edition of ICD-10-CM C75. Authors. ICD-10 Basics Check out these videos to learn more about ICD-10. Search All ICD-10; ICD-10-CM Diagnosis Codes; ICD-10-PCS Procedure Codes; ICD-10-CM Diagnosis Index;. Free, official information about 2008 (and also 2009-2015) ICD-9-CM diagnosis code 193, including coding notes, detailed descriptions, index cross-references and ICD-10-CM conversion. Thyroid cancer cells that spread to the lungs, liver and bones can be treated with heat and cold to kill the cancer cells. 00 may differ. It’s characterized by finger-like extensions of cancer. While The Bethesda System for Reporting Thyroid Cytopathology (TBSRTC) has provided invaluable terminology standardization, a performance comparison for this diagnostic category has. unless the tumor is papillary and/or. About 80% to 85% of papillary thyroid cancers can be removed surgically. All neoplasms are classified in this chapter, whether. 15. 8 to 14. The survival rate for papillary thyroid cancer is excellent. Applicable To. Papillary Thyroid Cancer (PTC) Papillary thyroid cancer is the most common type of thyroid cancer. C45-C49 Malignant neoplasms. 4; Surveillance Research Program of the National Cancer Institute). Introduction. Papillary thyroid carcinoma (PTC) is the most common form of well-differentiated thyroid cancer, and the most common form of thyroid cancer to result from exposure to radiation. C30-C39 Malignant neoplasms of respiratory and intrathoracic organs. with follicular adenoma, follicular carcinoma (Mod Pathol 2010;23:1191) Follicular variants of papillary thyroid carcinoma more commonly harbor RAS type mutations than classic. There are 5 main types of thyroid cancer: Not Papillary thyroid cancer. doi: 10. Subcategories of squamous cell carcinoma include:. These tumors are not always cancer. E07. Get free rules, notes, crosswalks, synonyms, history for ICD-10 code Z85. e. ICD-10-CM Diagnosis Code Z81. Left chronic giant papillary conjunctivitis. 3%. Pathology. Disorder of thyroid, unspecified. Of the 667 patients with papillary thyroid cancer treated with radioactive iodine therapy, 570 patients were included in this study. ICD 10 code for Personal history of malignant neoplasm of other endocrine glands. the doctor's impression was that the patient had papillary carcinoma of the thyroid. Free, official information about 2009 (and also 2010-2015) ICD-9-CM diagnosis code 193, including coding notes, detailed descriptions, index cross-references and ICD-10-CM conversion. Do not code replacement therapy as treatment unless the tumor is papillary and/or follicular. 15. These microcarcinomas typically are papillary thyroid cancer, the most common type of thyroid cancer. 1% and a major complication rate of 1. This is the American ICD-10-CM version of C55 - other international versions of ICD-10 C55 may differ. 1 became effective on October 1, 2023. 6 - other international versions of ICD-10 C67. Medullary thyroid cancer is a form of thyroid carcinoma which originates from the parafollicular cells (C cells), which produce the hormone calcitonin. 0 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Introduction. Code of Conduct; Developers;The purpose of this review is to describe the contemporary evaluation and management of tall cell variant of papillary thyroid carcinoma with an emphasis on the clinical features. Most patients with well-differentiated thyroid cancer have resectable tumors, and the results from surgery, radioiodine, and thyroxine therapy are excellent. 1 New Terms and Codes Not Yet Implemented The NAACCR Guidelines for ICD-O-3 Update Implementation (published December 2013) included a table of new ICD-O-3 codes and terms effective for 2015; however, the use of the new codes was postponed due to issues with adding these codes to the CSv2 software. More than 90% of adults with this cancer survive at least 10 to 20 years. doi: 10. Papillary thyroid cancer in a struma ovarii in a 17-year-old nulliparous patient: a case report. The follicular variant of papillary thyroid carcinoma (FVPTC) presents a type of papillary thyroid cancer that has created continuous diagnosis and treatment controversies among clinicians and pathologists. 0 became effective on October 1, 2023. This is the American ICD-10-CM version of C67. H Rule: Code papillary carcinoma, follicular variant of thyroid (8340) when there are multiple papillary and. ATC is an uncommon form of thyroid cancer only accounting for 1-2% of cases, but due to its high mortality, is responsible for 20-50% of deaths from thyroid cancer. unspecified type 193. 10 - other international versions of ICD-10 C74. 500 results found. Coding Guidelines . Most goiters are not cancer. Code Classification: Neoplasms (C00–D49) Malignant neoplasms of thyroid and other endocrine glands (C73-C75) Malignant neoplasm of thyroid gland (C73) C73 Malignant neoplasm of thyroid gland. pure follicle type M8331 3 193. All neoplasms are classified in this chapter. This is the American ICD-10-CM version of C75. PTC is a slowly progressive cancer with high survival rate. A CHEK2 c. Most nodules are benign with only 5-10% of nodules being cancerous. We followed the ICD-10-AM alphabetical index and came to: Carcinoma - papillary - - thyroid (M8260/3) But when we confirmed the definition in the ICD-10-AM tabular index we found that M8260/3 reads Papillary adenocarcinoma NOS. The 2024 edition of ICD-10-CM C75. PTC is an unencapsulated tumor with papillary and follicular structures characterized histologically by overlapping cell nuclei with ground glass appearance and invaginations of cytoplasm into. Given this change in treatment paradigms, an increasing number of people are undergoing hemithyroidectomy. 2019. About 50% of PTC are of the classical subtype, while the other 50% are made up of less common histologic variants. follicular M8330 3. 1% were cancerous at final pathology, 5. 2 [convert to ICD-9-CM] Rupture of papillary muscle, not elsewhere classified. Within the last few years, the diagnostic criteria for this. Papillary thyroid cancer can often spread to lymph nodes. 1 became effective on October 1, 2023. 5 and 0. ICD-10 Games Learn codes with classic games like Flashcards and Hangman. The 2024 edition of ICD-10-CM E89. ICD-10-CM Coding Rules. It is. 0 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Code Hormone. To decreaseThyroid neoplasm is a neoplasm or tumor of the thyroid. 62 year old woman with 2 different types of RAS mutations in a papillary thyroid carcinoma from a struma ovarii and papillary thyroid microcarcinoma of the thyroid (J Endocr Soc 2018;2:944)Eight out of 10 people who have thyroid cancer develop the papillary type. 1 - other international versions of ICD-10 C56. 850 for Personal history of malignant neoplasm of thyroid is a medical classification as listed by WHO under the range - Factors influencing health status and contact with health services . The ICD code C73 is used to code Poorly differentiated thyroid cancer. 1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. There remains much debate among thyroid cancer. ICD-10. Papillary muscle rupture; Rupture of papillary muscle; rupture of papillary muscle as current complication following acute myocardial infarction (I23. Purpose: To explore the risk factors that may predict the lymph node metastasis potential of these lesions and new prevention strategies in papillary thyroid carcinoma patients. More than half of the patients required. See also, ICD-10 Table of Neoplasms. Lymphoepithelioma (Schminke tumor) (also. Find out the code history, synonyms, clinical information and MS-DRG groupings for C73. Thyroid Gland C739 . Incidence rates were calculated for each year using SEER*Stat software (version 8. Thyroid biopsy is the procedure of choice to identify patients who require surgery for a potential cancer, but it is not a perfect test. When the biopsy diagnosis is in question, some patients. 9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. This is the American ICD-10-CM version of D09. The diagnosis of papillary thyroid cancer may occur at. However, not all histologic types of the neoplasms have specific ICD-O code numbers. The ratio of follicular adenoma to follicular carcinoma in surgical specimen is approximately 5 to 1 [ 3 ]. Now, with more effective imaging, they can detect cancers measuring 0. 3 may differ. ICD-10-CM code: The patient has papillary thyroid cancer. The 2024 edition of ICD-10-CM Z80. Look in the ICD-10-CM Alphabetic Index for Cancer - see also Neoplasm, by site, malignant. 858. The patient was extubated observing bilateral movement of the vocal cords. It is a differentiated thyroid cancer, meaning that the tumor looks similar to normal thyroid tissue under a microscope. There remains much debate among thyroid cancer OBJECTIVE. A total of 40,672 tumor records with a thyroid cancer diagnosis were identified using the primary site code C73. The patient was extubated observing bilateral movement of the vocal cords. Specialty: Oncology. Learn more about the importance of site-specific metastasis and survival in PTC by. 2% (J Clin Endocrinol Metab 2014;99:E276) In Asia, incidence is much lower ( 10%) due to certain biological differences and historically higher diagnostic threshold for PTC nuclei (Endocr Pathol. Computed tomography incidentally revealed multiple lung nodules. With papillary thyroid cancer, the presence of a BRAF mutation is associated with a higher risk of recurrence and spread to lymph nodes. The 2024 edition of ICD-10-CM C54. H46. All neoplasms are classified in this chapter, whether. Papillary carcinoma appears as an irregular solid or cystic mass or nodule in a normal thyroid parenchyma. 20071076, 20081127, 20110027, 20150023, and 20180008). ICD-10-CM Code for Personal history of malignant neoplasm of thyroid Z85. 500 results found. Search All ICD-10. multiple SINQ entries instructing registrars not to use code 8341/3 for diagnoses of micropapillary carcinoma of the thyroid (including SINQ. 9 (i. Papillary thyroid carcinoma (PTC) has become one of the most common malignancies of the endocrine system, with an average annual incidence growth rate of 6% worldwide (). Major complications include voice change, nodule. Methods Clinical, radiographic, and cytopathologic findings were retrospectively analyzed in a pediatric cohort (≤19 years) identified with ICD-10 codes for thyroid nodules and thyroid cancer from January 2017 until May 2021. C67. 10 may differ. ICD coding. Select. 6 may differ. World J Surg Oncol 2020 ;18(1):167. This review evaluates the established use of 18F-FDG PET/CT in papillary, follicular, Hürthle cell, anaplastic, and medullary thyroid cancers. ICD-9-CM 193 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 193 should only be used for claims with a date of service on or before September 30, 2015. Metastatic thyroid cancer is. C73. Most patients with a follicular adenoma are clinically and biochemically euthyroid. (Sequence correctly. ICD-10-CM code: The patient has papillary thyroid cancer. . He K. The 2024 edition of ICD-10-CM D34 became effective on October 1, 2023. 1 became effective on October 1, 2021. A hypoechoic mass measuring 8. There is another digit after the slash. Papillary muscle rupture; Rupture of papillary muscle; rupture of papillary muscle as current complication following acute myocardial infarction (I23. Toggle navigation. Papillary muscle rupture; Rupture of papillary muscle; rupture of papillary muscle as current complication following acute myocardial infarction (I23. Hurthle cell carcinoma (HCC) of the thyroid gland is one of the lesser-known thyroid cancer types. Cancer of the thyroid, metastatic to bone; Cancer of the thyroid, papillary; Cancer of the thyroid, with metastasis to bilateral lungs; Cancer of the thyroid, with metastasis to left lung; Cancer of the thyroid, with. Nodules that are 7-10 mm occasionally will exhibit suspicious features that do prompt a needle biopsy (fine needle aspiration). 32. Explore these free sample topics:. Subsequently, the patient was closely examined for a primary lesion in the thyroid gland. 0 – N80. But if a tumor is small enough and of a slow-growing variety that makes it low-risk, we might just recommend observation. 2 - other international versions of ICD-10 C48. This is the American ICD-10-CM version of C75. R: Right. 8. C73-C75 - Malignant neoplasms of thyroid and other endocrine glands. The 2024 edition of ICD-10-CM C48. SEER Program Coding and Staging Manual 2021 Appendix C: Coding Guidelines 1 . 9)Background: The extent of surgery for differentiated thyroid cancer (DTC) remains a controversial issue. 500 results found. Four separate Cox regression models were developed toTo elucidate the survival impact of strap muscle invasion of any degree in thyroid cancers, the Surveillance, Epidemiology, and End Results (SEER) database (1973–2018) was queried for thyroid. Nodules that are 7-10 mm occasionally will exhibit suspicious features that do prompt a needle biopsy (fine needle aspiration). Papillary thyroid cancer can often spread to lymph nodes. 1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Cibas, MD,1 and Syed Z. This study examined the risk of survival in patients with small thyroid cancers that were treated total thyroidectomy vs lobectomy. ICD-O: 8342/3 - papillary carcinoma, oxyphilic cell ICD-10: C73 - malignant neoplasm of thyroid gland Epidemiology. This is the most common type of thyroid cancer. 1 topography code C73. Hürthle cell carcinoma of the thyroid gland is an unusual and relatively rare type of differentiated thyroid cancer. Recent findings . 912 became effective on October 1, 2023. Destroying cancer cells with heat and cold. In a report based on the Surveillance, Epidemiology, and End Results. Many reoperations for papillary thyroid carcinoma are for management of persistent disease. Most patients are 25 to 65 years of age when first diagnosed; women are more affected than men. C54. 89 - other international versions of ICD-10 C79. About half of the patients were followed more than 10 years after thyroid cancer treatment. The code is exempt from present on admission (POA) reporting for. This study analyzes the clinical features, treatment outcomes, and prognostic factors of PTC patients with brain and multi-organ metastases. The 2024 edition of ICD-10-CM C79. 0 may differ. ICD-0 : 8260/3 – papillary. Open wound of. 01. The use of recombinant human thyrotropin and low-dose (1. 0 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Brain metastasis is a rare but serious complication of papillary thyroid cancer (PTC), affecting survival and quality of life. Benign neoplasm of thyroid gland. 5) ICD-10-CM Diagnosis Code S11. 0 became effective on October 1, 2023. 3 became effective on October 1, 2023. Objective: To identify high-risk factors for long-term recurrence in patients with small PTC by stratifying their pathologic characteristics. This specific type of thyroid cancer is very rare in humans (about 600 cases per year in the United States) so even if liraglutide increased the risk for a patient to develop it, cases still might. "Z85. This is the American ICD-10-CM version of D09. Ali, MD2 Key Words: Thyroid; Cytology; Fine-needle aspiration; Terminology DOI: 10. 850 is a billable diagnosis code used to specify a medical diagnosis of personal history of malignant neoplasm of thyroid. 3. All neoplasms are classified in this chapter, whether. Although it is difficult to assess the aggressiveness of a tumour on size criteria, less than a total thyroidectomy and active surveillance can be considered for the majority of patients with mPTC. C00-D49. C00-C75 - Malignant neoplasms, stated or presumed to be primary (of specified sites), and certain specified histologies, except neuroendocrine, and of lymphoid, hematopoietic and related tissue. 113 became effective on October 1, 2023. The latter diagnosis was identified using the ICD-9 code for thyroid cancer: 193. Five percent of thyroid cancer patients, however, will eventually succumb to their disease. Influence of Nomenclature Changes on Trends in Papillary Thyroid Cancer Incidence in the United States, 2000 to 2017. doi: 10. This was followed by 8% follicular, 2% medullary, and 1% anaplastic (Figure 1A, Table 1B). This is the American ICD-10-CM version of C67. C53. Papillary thyroid carcinoma (PTC), medullary thyroid carcinoma (MTC), follicular. Papillary thyroid cancer has the fastest increasing incidence of any thyroid malignancy and accounts for the majority of thyroid neoplasms (75-85%). 0544 [Google Scholar]The study cohort comprised adult patients with papillary thyroid carcinoma or follicular/Hurthle cell carcinoma diagnosed between 1 January 2004 and 31 December 2015. by TNM staging. Stan. 850 is considered exempt from POA reporting. Abstract. ATC is an uncommon form of thyroid cancer only accounting for 1-2% of cases, but due to its high mortality, is responsible for 20-50% of deaths from thyroid cancer. The ICD code C73 is used to code Poorly differentiated thyroid cancer. What are the CPT® and ICD-10-CM codes reported? CPT® code: [a] ICD-10-CM code: [b], CASE 2 PREOPERATIVE DIAGNOSIS: Papillary thyroid cancer. " ICD-10-CM, 10th ed. Changes in total thyroidectomy versus thyroid lobectomy for papillary thyroid cancer during the past 15 years. Dataset for Thyroid Cancer Histopathology Reports in section 5. Of the 102 cases that were analyzed, 77% were female and the average age was 48. Although the cells in a NIFTP have features that look like papillary thyroid cancer, this finding alone does not mean NIFTPs are malignant. A corresponding procedure code must accompany a Z code if a procedure is performed. C74. , thyroid) and diagnostic codes of papillary and/or follicular histology, as previously described . This is the American ICD-10-CM version of D44. 99 per 100,000 (). 2 inch. The American Thyroid Association (ATA) and National Comprehensive Cancer Network (NCCN) thyroid cancer guidelines recommend hemithyroidectomy as an acceptable surgical treatment option for low-risk thyroid cancer. 10 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. To decreaseThyroid neoplasm is a neoplasm or tumor of the thyroid. The code in the Malignant Primary column is C73. Materials and Methods: In total, 9,369 papillary thyroid carcinoma patients with 37. Showing 1-25: ICD-10-CM Diagnosis Code C73 [convert to ICD-9-CM] Malignant neoplasm of thyroid gland. This is the American ICD-10-CM version of C73 other international versions of ICD-10 C73 may differ. Type 1 Excludes. Patients now present with central compartment metastatic disease after initial thyroid cancer surgery,. The WHO Classification of Endocrine Organs states that this variant is composed of cells that are as tall as they are wide, and show abundant eosinophilic (oncocytic-like) cytoplasm. 1 2) T45. 850 for Personal history of malignant neoplasm of thyroid is a medical classification as listed by WHO under the range - Factors influencing health status and contact with health services . Coding Guidelines . 850 Personal history of malignant neoplasm of thyroid . 02:12. 51 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. If the primary is thyroid and the pathology states papillary microcarcinoma or micropapillary carcinoma, code 8260 is correct. Adverse effect of thyroid hormone; Thyroid agent adverse reaction. e. 6 × 4. Papillary thyroid cancer (papillary thyroid carcinoma, PTC) is the most common type of thyroid cancer, representing 75 percent to 85 percent of all thyroid cancer cases. Updated 1/10/18 Status ICD‐O‐3 Morphology Code Term Reportable Y/N Comments New Term 8343/2 Non‐invasive EFVPTC (C73. Papillary carcinoma appears as an irregular solid or cystic mass or nodule in a normal thyroid parenchyma. The median time to first reoperation was 21 months (range, 1-292), and 42% occurred within 1 year. 850 may differ. Malignant neoplasm of esophagus, unspecified. 10XA [convert to ICD-9-CM] Unspecified open wound of thyroid gland, initial encounter. Enlargement of the thyroid gland that may increase from about 20 grams to hundreds of grams in human adults. is a nonprofit 501(c)(3) organization (tax ID #52-2169434) of thyroid cancer survivors, family members, and health care professionals. 2 ICD-O-3 Histologies 2. Thyroiditis (inflammation of thyroid) in pregnancy; Thyroiditis in pregnancy; ICD-10-CM O99. 0. ) Colitis due to Clostridium difficile, specified as to recurrent. Background: Although multifocality is often observed in papillary thyroid carcinoma (PTC), the associations with clinicopathologic factors and the prognostic value are still controversial. Investigators reviewed pathology specimens from 61 follicular variant papillary thyroid cancers obtained between 2009 and 2016 from the University of Chicago. 7 is grouped within Diagnostic Related Group(s) (MS-DRG v 41. 10. Z85. 4 After thyroidectomy, radioiodine (iodine-131. Hürthle cell cancer accounts for only about 3-10% of all differentiated thyroid cancers; therefore, few institutions have extensive experience with Hürthle cell neoplasms. It has not spread to nearby lymph nodes (N0) or distant sites (M0). A nomogram to predict skip metastasis in papillary thyroid cancer. . attention. The tumor in the right lobe of the thyroid is diagnosed as papillary thyroid cancer, consistent with the lung tumor. unless the tumor is papillary. The code in the Malignant Primary column is C73. The median survival time after. Papillary thyroid carcinoma (PTC) is the most common histologic type of differentiated thyroid cancer, accounting for about 80% of thyroid carcinoma, and it is characterized by early regional lymph metastasis, but has a favorable prognosis with the 10-year relative survival rate of 93%. Thyroid cancer has a wide range of clinical behaviors, from slow-growing, indolent, to extremely aggressive tumors with significant fatalities. 7 [convert to ICD-9-CM] Carcinoma in situ of other specified digestive organs. Open bite of thyroid gland. 1 [convert to ICD-9-CM] appropriate for other thyroid cancers. Its peak incidence is between ages 40 and 60 years, as compared with papillary thyroid cancer incidence peaking earlier, between the ages of 30 to 50 years. More than half of the patients required. Disease characteristics. Thyroid nodules are very common, occurring in up to 50% of people. Papillary thyroid cancer accounts for more than 90% of all cases . C15. Showing 1-25: ICD-10-CM Diagnosis Code C73 [convert to ICD-9-CM] Malignant neoplasm of thyroid gland. This free tool is designed to help billers and coders navigate the new ICD-10-CM code set. Papillary muscle rupture; Rupture of papillary muscle; rupture of papillary muscle as current complication following acute myocardial infarction (I23. 9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. If the maximum size of PTC is ≤ 1. Thyroglobulin level in fine-needle aspirates for preoperative diagnosis of cervical lymph node metastasis in patients with papillary thyroid carcinoma: two different cutoff values according to serum thyroglobulin level. This is the American ICD-10-CM version of E07. C48. 2 Malignant neoplasm of left kidney, except ren. 15. ICD-10: C73 - malignant neoplasm of thyroid gland ICD-O:. ICD-10-CM Diagnosis Code S19. unless the tumor is papillary. ICD-10 code for papillary thyroid cancer? Solution. (malignant) neoplasms of the thyroid gland (International Classification of Diseases for Oncology, third edition [ICD-O-3] topography code C73.