M90.551 — Osteonecrosis in diseases classified elsewhere, right thigh
Is M90.551 billable?
Yes — M90.551 is billable for FY2027. M90.551 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. M90.551 may be submitted for encounters from October 1, 2026 through September 30, 2027.
M90.551 at a glance
| Code | M90.551 |
|---|---|
| Description | Osteonecrosis in diseases classified elsewhere, right thigh |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
What Medicare edits apply to M90.551?
The Medicare Code Editor screens inpatient claims before they are grouped. These edits name M90.551 directly.
This code describes a manifestation of an underlying disease. The underlying condition must be sequenced before it, so it can never be the principal or first-listed diagnosis.
Which MS-DRGs does M90.551 group to?
M90.551 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
As a secondary diagnosis, M90.551 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is M90.551 listed in the Alphabetic Index?
The Alphabetic Index lists these routes under M90.55, the nearest indexed parent of M90.551. Use them to find the family, then select the specific code.
- Osteonecrosis › secondary NEC › due to › hemoglobinopathy NEC › femur
- Osteonecrosis › secondary NEC › in › caisson disease › femur
Excludes1 — never code together — inherited from M86-M90
The conditions below can never be reported together with M90.551 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- postprocedural osteopathies (M96.-)
Excludes1 — never code together — inherited from M90
The conditions below can never be reported together with M90.551 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Code first — inherited from M90.5
The underlying condition below must be sequenced before M90.551. M90.551 describes a manifestation and cannot be the principal or first-listed diagnosis.
Excludes2 — not included here — inherited from Chapter 13
The conditions below are not part of M90.551, but a patient may have both at the same time. When documentation supports it, M90.551 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)
How long has M90.551 existed?
M90.551 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.