ICDcodes.org
FY2027

C84.A3 — Cutaneous T-cell lymphoma, unspecified, intra-abdominal lymph nodes

BillableUnspecifiedCC

Is C84.A3 billable?

Yes, but C84.A3 is an unspecified code. C84.A3 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, C84.A3 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting C84.A3 — the more specific alternatives are listed below.

C84.A3 at a glance

CodeC84.A3
DescriptionCutaneous T-cell lymphoma, unspecified, intra-abdominal lymph nodes
BillableYes
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

Which MS-DRGs does C84.A3 group to?

C84.A3 sits in MDC 17 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

  • 820Lymphoma and Leukemia with Major O.R. Procedures with MCCsurgical
  • 821Lymphoma and Leukemia with Major O.R. Procedures with CCsurgical
  • 822Lymphoma and Leukemia with Major O.R. Procedures without CC/MCCsurgical

As a secondary diagnosis, C84.A3 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.

How is C84.A3 listed in the Alphabetic Index?

The Alphabetic Index lists these routes under C84.A, the nearest indexed parent of C84.A3. Use them to find the family, then select the specific code.

  • Lymphoma › cutaneous T-cell (of) (malignant)

Excludes1 — never code together — inherited from C84

The conditions below can never be reported together with C84.A3 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

  • personal history of non-Hodgkin lymphoma (Z85.72)

Excludes2 — not included here — inherited from C81-C96

The conditions below are not part of C84.A3, but a patient may have both at the same time. When documentation supports it, C84.A3 and the excluded code may both be reported.

  • Kaposi's sarcoma of lymph nodes (C46.3)
  • secondary and unspecified neoplasm of lymph nodes (C77.-)
  • secondary neoplasm of bone marrow (C79.52)
  • secondary neoplasm of spleen (C78.89)

How long has C84.A3 existed?

C84.A3 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.

What other codes are in the C84.A family? (10)