ICD-10-CM 2027 diagnosis code
M18.2Bilateral post-traumatic osteoarthritis of first carpometacarpal joints
M18.2 is a valid, billable ICD-10-CM code for bilateral post-traumatic osteoarthritis of first carpometacarpal joints. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Bi post-trauma osteoarth of first carpometacarp joints
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 M18.2
M18.2 is the ICD-10-CM diagnosis code for bilateral post-traumatic osteoarthritis of first carpometacarpal joints. It belongs to category M18 (osteoarthritis of first carpometacarpal joint), block M15-M19 (osteoarthritis) 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 M18 (osteoarthritis of first carpometacarpal joint), M18.2 is specifically for bilateral post-traumatic osteoarthritis of first carpometacarpal joints. Related codes cover bilateral primary osteoarthritis of first carpometacarpal joints (M18.0), unilateral primary osteoarthritis of first carpometacarpal joint (M18.1), unilateral post-traumatic osteoarthritis of first carpometacarpal joint (M18.3), other bilateral secondary osteoarthritis of first carpometacarpal joints (M18.4), other unilateral secondary osteoarthritis of first carpometacarpal joint (M18.5) and unspecified (M18.9).
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 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 715.24 (Osteoarthrosis, localized, secondary, hand).
Notes that apply from higher levels
Instructions written at a parent level also apply to M18.2.
Broader instructions also apply from M15-M19 Osteoarthritis and Chapter 13: Diseases of the musculoskeletal system and connective tissue.
Alphabetic index entries
1 entriesTerms in the official ICD-10-CM index that lead to M18.2.
Codes whose notes reference M18.2
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 →- 715.24Osteoarthrosis, localized, secondary, handapproximate
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 M18.2
Is M18.2 billable?
- Yes. M18.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M18.2 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M18.2 as a principal diagnosis.
Is M18.2 a CC or MCC?
- No. M18.2 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does M18.2 group to?
- M18.2 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 M18.2?
- The CMS General Equivalence Mappings map M18.2 to ICD-9-CM 715.24.