C7B.1 Secondary Merkel cell carcinoma

Billable ICD-10-CM code, FY2026.

Applicable to

• Merkel cell carcinoma nodal presentation
• Merkel cell carcinoma visceral metastatic presentation

Applies from C7B Secondary neuroendocrine tumors

Use additional code

• code to identify any functional activity

Risk adjustment (HCC)

• CMS-HCC V28: HCC 17 — Cancer Metastatic to Lung, Liver, Brain, and Other Organs; Acute Myeloid Leukemia Except Promyelocytic
• CMS-HCC V22: HCC 8 — Metastatic Cancer and Acute Leukemia
• RxHCC V08: HCC 18 — Secondary Cancer of Lung, Liver, Brain, and Other Sites
• ESRD V24: HCC 8

MS-DRG index

Defines the logic of DRG(s) 826-828 in MDC 17.

Approximate ICD-9-CM (GEMs)

• 209.75 Secondary Merkel cell carcinoma (approximate)

Code annotations containing back-references to C7B.1

Back-references to C7B.1

• Type 1 Excludes: C79.2 Secondary malignant neoplasm of skin ("secondary Merkel cell carcinoma (C7B.1)")

Back-references to C7B

• Type 1 Excludes: C79 Secondary malignant neoplasm of other and unspecified sites ("secondary carcinoid tumors (C7B.-)")
• Type 1 Excludes: C79 Secondary malignant neoplasm of other and unspecified sites ("secondary neuroendocrine tumors (C7B.-)")
• Code Also: E34.0 Carcinoid syndrome ("secondary neuroendocrine tumors (C7B.-)")

Diagnosis Index entries for C7B.1

• Carcinoma (malignant) › Merkel cell › nodal presentation
• Carcinoma (malignant) › Merkel cell › secondary
• Carcinoma (malignant) › Merkel cell › visceral metastatic
• Carcinoma (malignant) › secondary › Merkel cell

Nearby codes

• C7B.01 Secondary carcinoid tumors of distant lymph nodes
• C7B.02 Secondary carcinoid tumors of liver
• C7B.03 Secondary carcinoid tumors of bone
• C7B.04 Secondary carcinoid tumors of peritoneum
• C7B.09 Secondary carcinoid tumors of other sites
• C7B.1 Secondary Merkel cell carcinoma (this code)
• C7B.8 Other secondary neuroendocrine tumors