2027 ICD-10-CM Diagnosis Code M1AChronic gout

ICD-10-CM Codes›M00–M99›M05-M14›M1A

ICD-10-CM M1A
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

M1A is a non-billable ICD-10-CM category code for chronic gout, so it cannot be submitted on claims. Use a more specific code from this category instead, such as M1A.00X0, M1A.00X1, M1A.0110, and M1A.0111.

Code Identity

ICD-10-CM Code
M1A
Billable Status
No — Non-Billable Category
Code Describes
Chronic gout
Short Description
Chronic gout
Same as the full description in the CMS dataset.
Chapter
M05-M14
Inflammatory polyarthropathies

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM05-M14Inflammatory polyarthropathies
CategoryM1AChronic gout
This CodeM1AChronic gout

Specific Coding for Chronic goutOverview

Non-specific codes like M1A require more characters. Use one of these billable codes instead:

  • M1A.0 for Idiopathic chronic gout

  • M1A.00 for Idiopathic chronic gout, unspecified site

  • M1A.01 for Idiopathic chronic gout, shoulder

  • M1A.02 for Idiopathic chronic gout, elbow

  • M1A.03 for Idiopathic chronic gout, wrist

  • M1A.04 for Idiopathic chronic gout, hand

  • M1A.05 for Idiopathic chronic gout, hip

  • M1A.06 for Idiopathic chronic gout, knee

  • M1A.07 for Idiopathic chronic gout, ankle and foot

  • M1A.08 for Idiopathic chronic gout, vertebrae

  • M1A.09 for Idiopathic chronic gout, multiple sites

  • M1A.1 for Lead-induced chronic gout

  • M1A.10 for Lead-induced chronic gout, unspecified site

  • M1A.11 for Lead-induced chronic gout, shoulder

  • M1A.12 for Lead-induced chronic gout, elbow

  • M1A.13 for Lead-induced chronic gout, wrist

  • M1A.14 for Lead-induced chronic gout, hand

  • M1A.15 for Lead-induced chronic gout, hip

  • M1A.16 for Lead-induced chronic gout, knee

  • M1A.17 for Lead-induced chronic gout, ankle and foot

  • M1A.18 for Lead-induced chronic gout, vertebrae

  • M1A.19 for Lead-induced chronic gout, multiple sites

  • M1A.2 for Drug-induced chronic gout

  • M1A.20 for Drug-induced chronic gout, unspecified site

  • M1A.21 for Drug-induced chronic gout, shoulder

  • M1A.22 for Drug-induced chronic gout, elbow

  • M1A.23 for Drug-induced chronic gout, wrist

  • M1A.24 for Drug-induced chronic gout, hand

  • M1A.25 for Drug-induced chronic gout, hip

  • M1A.26 for Drug-induced chronic gout, knee

  • M1A.27 for Drug-induced chronic gout, ankle and foot

  • M1A.28 for Drug-induced chronic gout, vertebrae

  • M1A.29 for Drug-induced chronic gout, multiple sites

  • M1A.3 for Chronic gout due to renal impairment

  • M1A.30 for Chronic gout due to renal impairment, unspecified site

  • M1A.31 for Chronic gout due to renal impairment, shoulder

  • M1A.32 for Chronic gout due to renal impairment, elbow

  • M1A.33 for Chronic gout due to renal impairment, wrist

  • M1A.34 for Chronic gout due to renal impairment, hand

  • M1A.35 for Chronic gout due to renal impairment, hip

  • M1A.36 for Chronic gout due to renal impairment, knee

  • M1A.37 for Chronic gout due to renal impairment, ankle and foot

  • M1A.38 for Chronic gout due to renal impairment, vertebrae

  • M1A.39 for Chronic gout due to renal impairment, multiple sites

  • M1A.4 for Other secondary chronic gout

  • M1A.40 for Other secondary chronic gout, unspecified site

  • M1A.41 for Other secondary chronic gout, shoulder

  • M1A.42 for Other secondary chronic gout, elbow

  • M1A.43 for Other secondary chronic gout, wrist

  • M1A.44 for Other secondary chronic gout, hand

  • M1A.45 for Other secondary chronic gout, hip

  • M1A.46 for Other secondary chronic gout, knee

  • M1A.47 for Other secondary chronic gout, ankle and foot

  • M1A.48 for Other secondary chronic gout, vertebrae

  • M1A.49 for Other secondary chronic gout, multiple sites

  • M1A.9 for Chronic gout, unspecified

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to M1A: its own notes plus those printed at block M00-M25 and Chapter 13. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Block M00-M25 applies to 2,249 codes
  • Disorders affecting predominantly peripheral (limb) joints

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

On M1A itself
From Chapter 13 (M00-M99) Diseases of the musculoskeletal system and connective tissue applies to 6,687 codes
  • arthropathic psoriasis (L40.5-)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • compartment syndrome (traumatic) (T79.A-)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

  • 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)

Notes

General instructions on how these codes are used.

From Chapter 13 (M00-M99) Diseases of the musculoskeletal system and connective tissue applies to 6,687 codes
  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

  • The appropriate 7th character is to be added to each code from category M1A
Values for category M1A Chronic Gout Tophus
  • 0without tophus (tophi)
  • 1with tophus (tophi)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name M1A, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming M1A: they are not reported together with it, unless the two conditions are unrelated.

  • E72 Other disorders of amino-acid metabolism
    gout (M1A.-, M10.-)
  • E79 Disorders of purine and pyrimidine metabolism
    gout (M1A.-, M10.-)

Excludes2 2

These codes carry an Excludes2 note naming M1A: its condition is not part of those codes, and both may be reported when the patient has both.

  • H61.1 Noninfective disorders of pinna
    gouty tophi of ear (M1A.-)
  • M10 Gout
    chronic gout (M1A.-)

Code First 5

These codes say to code first a condition named in the note, and M1A is one of the conditions named.

  • G99.0 Autonomic neuropathy in diseases classified elsewhere
    gout (M1A.-, M10.-)
  • H22 Disorders of iris and ciliary body in diseases classified elsewhere
    gout (M1A.-, M10.-)
  • H62.8 Other disorders of external ear in diseases classified elsewhere
    gout (M1A.-, M10.-)
  • N08 Glomerular disorders in diseases classified elsewhere
    gout (M1A.-, M10.-)
  • N22 Calculus of urinary tract in diseases classified elsewhere
    gout (M1A.-, M10.-)

Patient EducationClinical

Gout

Gout is a common type of inflammatory arthritis. It causes pain, swelling, and redness in one or more joints. It usually happens as a flare, which can last for a week or two and then gets better. The flares often begin in your big toe or a lower limb.

The full article covers:

  • What is gout?
  • What causes gout?
  • Who is more likely to develop gout?
  • What are the symptoms of gout?
  • How is gout diagnosed?
  • What are the treatments for gout?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About M1AOverview

What is the ICD-10 code for chronic gout?

M1A is the ICD-10-CM category for chronic gout, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is M1A (Chronic gout) a billable code?

No. This is a category header that groups the codes for chronic gout, and headers cannot be submitted on claims. Claims for chronic gout need a more specific code from this category, such as M1A.00X0, M1A.00X1, and M1A.0110.

Can M1A be reported with a code from M10?

Not as a rule. The Excludes1 note on M1A lists "gout NOS (M10.-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

Does M1A need an additional code?

When the condition applies, yes. The Use Additional Code note reads: 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 listed in the Instructional Notes section. The additional code is reported after M1A.