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ICD-10-CM 2027 diagnosis code

M22.12Recurrent subluxation of patella, left knee

✓ Billable / specific

M22.12 is a valid, billable ICD-10-CM code for recurrent subluxation of patella, left knee. 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 M22.12

M22.12 is the ICD-10-CM diagnosis code for recurrent subluxation of patella, left knee. It belongs to category M22 (disorder of patella), 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 M22.1 (recurrent subluxation of patella), M22.12 is specifically for recurrent subluxation of patella, left knee. Related codes cover unspecified knee (M22.10) and right knee (M22.11).

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 562 (Fracture, Sprain, Strain and Dislocation Except Femur, Hip, Pelvis and Thigh with MCC, relative weight 1.398) and DRG 563 (Fracture, Sprain, Strain and Dislocation Except Femur, Hip, Pelvis and Thigh without MCC, relative weight 0.8985), 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 718.36 (recurrent dislocation of joint, lower leg).

Notes that apply from higher levels

Instructions written at a parent level also apply to M22.12.

› From M22 Disorder of patella
Excludes2
  • traumatic dislocation of patella (S83.0-)

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.

ICD-9-CM equivalent

Converter →
  • 718.36Recurrent dislocation of joint, lower legapproximate

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 M22.12

Is M22.12 billable?

Yes. M22.12 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can M22.12 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict M22.12 as a principal diagnosis.

Is M22.12 a CC or MCC?

No. M22.12 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does M22.12 group to?

M22.12 is used in the MS-DRG v44.0 logic for MS-DRG 562 (Fracture, Sprain, Strain and Dislocation Except Femur, Hip, Pelvis and Thigh with MCC) and MS-DRG 563 (Fracture, Sprain, Strain and Dislocation Except Femur, Hip, Pelvis and Thigh 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 M22.12?

The CMS General Equivalence Mappings map M22.12 to ICD-9-CM 718.36.