C96.20 — Malignant mast cell neoplasm, unspecified
Is C96.20 billable?
Yes, but C96.20 is an unspecified code. C96.20 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, C96.20 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 C96.20 — the more specific alternatives are listed below.
More specific alternatives
C96.20 at a glance
| Code | C96.20 |
|---|---|
| Description | Malignant mast cell neoplasm, unspecified |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does C96.20 group to?
C96.20 sits in MDC Pre 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.
- 011Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with MCCsurgical
- 012Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with CCsurgical
- 013Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy without CC/MCCsurgical
As a secondary diagnosis, C96.20 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is C96.20 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to C96.20. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Neoplasm, neoplastic › malignant mast cell
- Mast cell › neoplasm › malignant
Excludes1 — never code together — inherited from C96
The conditions below can never be reported together with C96.20 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 other malignant neoplasms of lymphoid, hematopoietic and related tissues (Z85.79)
Excludes1 — never code together — inherited from C96.2
The conditions below can never be reported together with C96.20 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Excludes2 — not included here — inherited from C81-C96
The conditions below are not part of C96.20, but a patient may have both at the same time. When documentation supports it, C96.20 and the excluded code may both be reported.
How long has C96.20 existed?
C96.20 first appears in FY2018 (FY2017 is not available, so it may have appeared then).
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.