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ICD-10-CM 2027 diagnosis code

M1A.021Idiopathic chronic gout, right elbow

Not billable — use a more specific codeRequires 7th character

M1A.021 is a header code, so it can't be reported by itself. Choose one of the 2 more specific codes beneath it and add the required 7th character.

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 M1A.021

M1A.021 is the ICD-10-CM diagnosis code for idiopathic chronic gout, right elbow. It belongs to category M1A (chronic gout), block M05-M14 (inflammatory polyarthropathies) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.

Within M1A.02 (idiopathic chronic gout, elbow), M1A.021 is specifically for idiopathic chronic gout, right elbow. Related codes cover left elbow (M1A.022) and unspecified elbow (M1A.029).

Codes in this range require a 7th character: 0 for without tophus (tophi) and 1 for with tophus (tophi). Use placeholder "X" characters to fill any empty positions before the 7th character.

Use an additional code to identify: Autonomic neuropathy in diseases classified elsewhere (G99.0), Calculus of urinary tract in diseases classified elsewhere (N22), Cardiomyopathy in diseases classified elsewhere (I43), Disorders of external ear in diseases classified elsewhere (H61.1-, H62.8-), Disorders of iris and ciliary body in diseases classified elsewhere (H22) and 1 more.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

7th character

The appropriate 7th character is to be added to each code from category M1A

Notes that apply from higher levels

Instructions written at a parent level also apply to M1A.021.

› From M1A Chronic gout
Excludes1
  • gout NOS (M10.-)
Excludes2
  • acute gout (M10.-)
Use additional code
  • code to identify:
  • Autonomic neuropathy in diseases classified elsewhere (G99.0)
  • Calculus of urinary tract in diseases classified elsewhere (N22)
  • Cardiomyopathy in diseases classified elsewhere (I43)
  • Disorders of external ear in diseases classified elsewhere (H61.1-, H62.8-)
  • Disorders of iris and ciliary body in diseases classified elsewhere (H22)
  • Glomerular disorders in diseases classified elsewhere (N08)

Broader instructions also apply from Chapter 13: Diseases of the musculoskeletal system and connective tissue.

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 M1A.021

Is M1A.021 billable?

No. M1A.021 is a header code. Report one of its more specific subcodes instead.