ICD-10-CM 2027 diagnosis code
M25.673Stiffness of unspecified ankle, not elsewhere classified
M25.673 is a valid, billable ICD-10-CM code for stiffness of unspecified ankle, not elsewhere classified. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
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 M25.673
M25.673 is the ICD-10-CM diagnosis code for Stiffness of unspecified ankle, not elsewhere classified. It belongs to category M25 (other joint disorder, not elsewhere classified), block M20-M25 (other joint disorders) 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 M25.67, choose M25.673 (unspecified ankle, not elsewhere classified) only when documentation doesn't support a more specific option: right ankle, not elsewhere classified (M25.671), left ankle, not elsewhere classified (M25.672), right foot, not elsewhere classified (M25.674), left foot, not elsewhere classified (M25.675) and unspecified foot, not elsewhere classified (M25.676).
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 555 (Signs and Symptoms of Musculoskeletal System and Connective Tissue with MCC, relative weight 1.2913) and DRG 556 (Signs and Symptoms of Musculoskeletal System and Connective Tissue without MCC, relative weight 0.8211), 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 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 719.57 (Stiffness of joint, not elsewhere classified, ankle and foot).
Notes that apply from higher levels
Instructions written at a parent level also apply to M25.673.
Broader instructions also apply from M20-M25 Other joint disorders 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 →- 719.57Stiffness of joint, not elsewhere classified, ankle and footapproximate
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 M25.673
Is M25.673 billable?
- Yes. M25.673 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M25.673 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M25.673 as a principal diagnosis.
Is M25.673 a CC or MCC?
- No. M25.673 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does M25.673 group to?
- M25.673 is used in the MS-DRG v44.0 logic for MS-DRG 555 (Signs and Symptoms of Musculoskeletal System and Connective Tissue with MCC) and MS-DRG 556 (Signs and Symptoms of Musculoskeletal System and Connective Tissue 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 M25.673?
- The CMS General Equivalence Mappings map M25.673 to ICD-9-CM 719.57.