ICD-10-CM 2027 diagnosis code
M63.862Disorders of muscle in diseases classified elsewhere, left lower leg
M63.862 is a valid, billable ICD-10-CM code for disorders of muscle in diseases classified elsewhere, left lower leg. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Disorders of muscle in diseases classd elswhr, l low 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 M63.862
M63.862 is the ICD-10-CM diagnosis code for disorders of muscle in diseases classified elsewhere, left lower leg. It belongs to category M63 (disorders of muscle in diseases classified elsewhere), block M60-M63 (disorders of muscles) 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 M63.86 (disorders of muscle in diseases classified elsewhere, lower leg), M63.862 is specifically for disorders of muscle in diseases classified elsewhere, left lower leg. Related codes cover right lower leg (M63.861) and unspecified lower leg (M63.869).
Code first underlying disease, such as: leprosy (A30.-), neoplasm (C49.-, C79.89, D21.-, D48.1-), schistosomiasis (B65.-) and trichinellosis (B75).
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 557 (Tendonitis, Myositis and Bursitis with MCC, relative weight 1.489) and DRG 558 (Tendonitis, Myositis and Bursitis without MCC, relative weight 0.8875), 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 728.9 (unspecified disorder of muscle, ligament, and fascia).
Notes that apply from higher levels
Instructions written at a parent level also apply to M63.862.
› From M63 Disorders of muscle in diseases classified elsewhere
Broader instructions also apply from M60-M63 Disorders of muscles 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 →- 728.9Unspecified disorder of muscle, ligament, and fasciaapproximate
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 M63.862
Is M63.862 billable?
- Yes. M63.862 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M63.862 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 M63.862 a CC or MCC?
- No. M63.862 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does M63.862 group to?
- M63.862 is used in the MS-DRG v44.0 logic for MS-DRG 557 (Tendonitis, Myositis and Bursitis with MCC) and MS-DRG 558 (Tendonitis, Myositis and Bursitis 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 M63.862?
- The CMS General Equivalence Mappings map M63.862 to ICD-9-CM 728.9.