M60.004 — Infective myositis, unspecified left leg
Is M60.004 billable?
Yes, but M60.004 is an unspecified code. M60.004 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, M60.004 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 M60.004 — the more specific alternatives are listed below.
M60.004 at a glance
| Code | M60.004 |
|---|---|
| Description | Infective myositis, unspecified left leg |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does M60.004 group to?
M60.004 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.
- 557Tendonitis, Myositis and Bursitis with MCCmedical
- 558Tendonitis, Myositis and Bursitis without MCCmedical
As a secondary diagnosis, M60.004 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is M60.004 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to M60.004. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Myositis › infective › leg › left
Inclusion terms
Alternative wording in documentation that is classified to M60.004.
- Infective myositis, left lower limb NOS
Excludes1 — never code together — inherited from M60-M63
The conditions below can never be reported together with M60.004 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Use additional code — inherited from M60.0
Report an additional code alongside M60.004 to fully describe the condition. M60.004 is sequenced first.
- code (B95-B97) to identify infectious agent
Excludes2 — not included here — inherited from Chapter 13
The conditions below are not part of M60.004, but a patient may have both at the same time. When documentation supports it, M60.004 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 M60-M63
The conditions below are not part of M60.004, but a patient may have both at the same time. When documentation supports it, M60.004 and the excluded code may both be reported.
- muscular dystrophies and myopathies (G71-G72)
Excludes2 — not included here — inherited from M60
The conditions below are not part of M60.004, but a patient may have both at the same time. When documentation supports it, M60.004 and the excluded code may both be reported.
- inclusion body myositis [IBM] (G72.41)
How long has M60.004 existed?
M60.004 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.