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ICD-10-CM 2027 diagnosis code

M79.669Pain in unspecified lower leg

✓ Billable / specific

M79.669 is a valid, billable ICD-10-CM code for pain in unspecified lower leg. 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 M79.669

M79.669 is the ICD-10-CM diagnosis code for pain in unspecified lower leg. It belongs to category M79 (other and unspecified soft tissue disorders, not elsewhere classified), block M70-M79 (other soft tissue 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 M79.66, choose M79.669 (unspecified lower leg) only when documentation doesn't support a more specific option: right lower leg (M79.661) and left lower leg (M79.662).

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 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 729.5 (pain in limb).

Notes that apply from higher levels

Instructions written at a parent level also apply to M79.669.

› From M79.6 Pain in limb, hand, foot, fingers and toes
Excludes2
› From M79 Other and unspecified soft tissue disorders, not elsewhere classified
Excludes1
  • psychogenic rheumatism (F45.8)
  • soft tissue pain, psychogenic (F45.41)

Broader instructions also apply from 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.

ICD-9-CM equivalent

Converter →
  • 729.5Pain in limbapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about M79.669

Is M79.669 billable?

Yes. M79.669 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can M79.669 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict M79.669 as a principal diagnosis.

Is M79.669 a CC or MCC?

No. M79.669 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does M79.669 group to?

M79.669 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 M79.669?

The CMS General Equivalence Mappings map M79.669 to ICD-9-CM 729.5.