ICD-10/C4A.59

C4A.59 ICD 2026 Code: Merkel cell carcinoma of other part of trunk

C4A.59 is the authoritative medical code for Merkel cell carcinoma of other part of trunk. This classification is used in medical billing and clinical recording to specify the clinical criteria for merkel cell carcinoma of other part of trunk (ICD-10-CM C4A.59), ensuring healthcare documentation aligns with 2026 federal coding standards.

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Official Registry Overview & Definition

Merkel cell carcinoma of other part of trunk is a billable ICD-10-CM diagnosis code C4A.59. Excludes2 (not included here): malignant neoplasm of anus NOS C21.0; malignant neoplasm of scrotum C63.2.

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for C4A.59 in the official ICD-10-CM tabular list.

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

  • malignant neoplasm of anus NOS C21.0
  • malignant neoplasm of scrotum C63.2

Frequently Asked Questions (FAQ) & Clinical Guidance

Can C4A.59 be reported alongside related conditions?

Per Excludes2 instructions, C4A.59 and the following may both be reported when both are present: malignant neoplasm of anus NOS (C21.0); malignant neoplasm of scrotum (C63.2).

Codes in This Family (32)

Official ICD-10-CM classifications in the same code family as C4A.59, with their registry titles.

  • C4A — Merkel cell carcinoma
  • C4A.0 — Merkel cell carcinoma of lip
  • C4A.1 — Merkel cell carcinoma of eyelid, including canthus
  • C4A.10 — Merkel cell carcinoma of unspecified eyelid, including canthus
  • C4A.11 — Merkel cell carcinoma of right eyelid, including canthus
  • C4A.111 — Merkel cell carcinoma of right upper eyelid, including canthus
  • C4A.112 — Merkel cell carcinoma of right lower eyelid, including canthus
  • C4A.12 — Merkel cell carcinoma of left eyelid, including canthus
  • C4A.121 — Merkel cell carcinoma of left upper eyelid, including canthus
  • C4A.122 — Merkel cell carcinoma of left lower eyelid, including canthus
  • C4A.2 — Merkel cell carcinoma of ear and external auricular canal
  • C4A.20 — Merkel cell carcinoma of unspecified ear and external auricular canal
  • C4A.21 — Merkel cell carcinoma of right ear and external auricular canal
  • C4A.22 — Merkel cell carcinoma of left ear and external auricular canal
  • C4A.3 — Merkel cell carcinoma of other and unspecified parts of face
  • C4A.30 — Merkel cell carcinoma of unspecified part of face
  • C4A.31 — Merkel cell carcinoma of nose
  • C4A.39 — Merkel cell carcinoma of other parts of face
  • C4A.4 — Merkel cell carcinoma of scalp and neck
  • C4A.5 — Merkel cell carcinoma of trunk
  • C4A.51 — Merkel cell carcinoma of anal skin
  • C4A.52 — Merkel cell carcinoma of skin of breast
  • C4A.6 — Merkel cell carcinoma of upper limb, including shoulder
  • C4A.60 — Merkel cell carcinoma of unspecified upper limb, including shoulder
  • C4A.61 — Merkel cell carcinoma of right upper limb, including shoulder
  • C4A.62 — Merkel cell carcinoma of left upper limb, including shoulder
  • C4A.7 — Merkel cell carcinoma of lower limb, including hip
  • C4A.70 — Merkel cell carcinoma of unspecified lower limb, including hip
  • C4A.71 — Merkel cell carcinoma of right lower limb, including hip
  • C4A.72 — Merkel cell carcinoma of left lower limb, including hip
  • C4A.8 — Merkel cell carcinoma of overlapping sites
  • C4A.9 — Merkel cell carcinoma, unspecified

Indexed Clinical Terms (1)

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.

  • Carcinoma (malignant), Merkel cell, trunk NEC

Related Codes & Numerical Sequence (Crawl Map)

Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures:

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