ICD-10-CM 2027 diagnosis code
M90.669Osteitis deformans in neoplastic diseases, unspecified lower leg
M90.669 is a valid, billable ICD-10-CM code for osteitis deformans in neoplastic diseases, unspecified lower leg. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Osteitis deformans in neoplastic diseases, unsp lower leg
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About M90.669
M90.669 is the ICD-10-CM diagnosis code for Osteitis deformans in neoplastic diseases, unspecified lower leg. It belongs to category M90 (Osteopathies in diseases classified elsewhere), block M86-M90 (other osteopathies) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
Within M90.66, choose M90.669 (unspecified lower leg) only when documentation doesn't support a more specific option: right lower leg (M90.661) and left lower leg (M90.662).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 553 (Bone Diseases and Arthropathies with MCC, relative weight 1.2494) and DRG 554 (Bone Diseases and Arthropathies without MCC, relative weight 0.8331), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It is a manifestation code, so it describes the effect of an underlying disease and can't be the principal diagnosis. Code the underlying condition first.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 731.1 (Osteitis deformans in diseases classified elsewhere).
Notes that apply from higher levels
Instructions written at a parent level also apply to M90.669.
Broader instructions also apply from M86-M90 Other osteopathies and Chapter 13: Diseases of the musculoskeletal system and connective tissue.
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 08 · Diseases and Disorders of the Musculoskeletal System and Connective Tissue
ICD-9-CM equivalent
Converter →- 731.1Osteitis deformans in diseases classified elsewhereapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about M90.669
Is M90.669 billable?
- Yes. M90.669 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M90.669 be used as a principal diagnosis?
- No. It is a manifestation code, so it describes the effect of an underlying disease and can't be the principal diagnosis. Code the underlying condition first.
Is M90.669 a CC or MCC?
- No. M90.669 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does M90.669 group to?
- M90.669 is used in the MS-DRG v44.0 logic for MS-DRG 553 (Bone Diseases and Arthropathies with MCC) and MS-DRG 554 (Bone Diseases and Arthropathies without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for M90.669?
- The CMS General Equivalence Mappings map M90.669 to ICD-9-CM 731.1.