M1A.0 – Idiopathic chronic gout

ICD-10-CM 2027 diagnosis code · Inflammatory polyarthropathies

Non-billable header

ICD-10-CM code M1A.0

Code: M1A.0 (claims format: M1A0)
Description: Idiopathic chronic gout
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 13. Diseases of the musculoskeletal system and connective tissue (M00-M99)
Block: M05-M14 Inflammatory polyarthropathies
Parent codes: M1A

Billable codes under M1A.0

M1A.0 is a header code and cannot be used on claims. Choose the most specific code:

M1A.00 – Idiopathic chronic gout, unspecified siteHeader (more codes below)
M1A.01 – Idiopathic chronic gout, shoulderHeader (more codes below)
M1A.02 – Idiopathic chronic gout, elbowHeader (more codes below)
M1A.03 – Idiopathic chronic gout, wristHeader (more codes below)
M1A.04 – Idiopathic chronic gout, handHeader (more codes below)
M1A.05 – Idiopathic chronic gout, hipHeader (more codes below)
M1A.06 – Idiopathic chronic gout, kneeHeader (more codes below)
M1A.07 – Idiopathic chronic gout, ankle and footHeader (more codes below)
M1A.08 – Idiopathic chronic gout, vertebraeHeader (more codes below)
M1A.09 – Idiopathic chronic gout, multiple sitesHeader (more codes below)

7th character values

Codes in this category need a 7th character to describe the encounter or episode of care (use placeholder X for empty positions).

Character	Meaning
`0`	without tophus (tophi)
`1`	with tophus (tophi)

Notes for M1A.0

Applicable to:

Chronic gouty bursitis
Primary chronic gout

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

M1A – Chronic gout

Excludes1 (not coded here):

gout NOS (M10.-)

Excludes2 (not included here):

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)

7th character note:

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

Related codes in M1A

M1A.1 – Lead-induced chronic goutHeader
M1A.2 – Drug-induced chronic goutHeader
M1A.3 – Chronic gout due to renal impairmentHeader
M1A.4 – Other secondary chronic goutHeader
M1A.9 – Chronic gout, unspecifiedHeader

Frequently asked questions

What is ICD-10 code M1A.0?

M1A.0 is the ICD-10-CM code for idiopathic chronic gout, in the block M05-M14 (Inflammatory polyarthropathies).

Is M1A.0 a billable code?

No. M1A.0 is a header code with more specific child codes; report one of the billable codes listed above.

What category does M1A.0 belong to?

It belongs to category M1A – Chronic gout.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.