M18.30 — Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, unspecified hand
Is M18.30 billable?
Yes, but M18.30 is an unspecified code. M18.30 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, M18.30 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 M18.30 — the more specific alternatives are listed below.
M18.30 at a glance
| Code | M18.30 |
|---|---|
| Description | Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, unspecified hand |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does M18.30 group to?
M18.30 sits in MDC 08 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 553Bone Diseases and Arthropathies with MCCmedical
- 554Bone Diseases and Arthropathies without MCCmedical
How is M18.30 listed in the Alphabetic Index?
The Alphabetic Index lists these routes under M18.3, the nearest indexed parent of M18.30. Use them to find the family, then select the specific code.
- Osteoarthritis › post-traumatic NEC › hand joint › first carpometacarpal joint
Excludes2 — not included here — inherited from Chapter 13
The conditions below are not part of M18.30, but a patient may have both at the same time. When documentation supports it, M18.30 and the excluded code may both be reported.
- arthropathic psoriasis (L40.5-)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- compartment syndrome (traumatic) (T79.A-)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Excludes2 — not included here — inherited from M15-M19
The conditions below are not part of M18.30, but a patient may have both at the same time. When documentation supports it, M18.30 and the excluded code may both be reported.
- osteoarthritis of spine (M47.-)
How long has M18.30 existed?
M18.30 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.