M1A.0
Idiopathic chronic gout
M1A.0 is a non-billable ICD-10-CM code header for idiopathic chronic gout. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are M1A.00 Idiopathic chronic gout, unspecified site; M1A.01 Idiopathic chronic gout, shoulder; M1A.02 Idiopathic chronic gout, elbow; M1A.03 Idiopathic chronic gout, wrist and 6 more. Its coding notes include a Use additional code instruction, 1 Excludes1 entry and 11 Excludes2 entries.
7th characters
Every code below needs one of these (defined at M1A).
The appropriate 7th character is to be added to each code from category M1A
- 0without tophus (tophi)
- 1with tophus (tophi)
Use additional code
Add the listed code as a secondary code, if known.
- 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)
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (10 notes)
- 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)
Inclusion terms
Conditions classified to this code.
- Chronic gouty bursitis
- Primary chronic gout
Notes
Also from chapter/block level (1 note)
- Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
More specific codes under M1A.0 10
- M1A.00Idiopathic chronic gout, unspecified site7th char needed
- M1A.01Idiopathic chronic gout, shoulderHeader
- M1A.02Idiopathic chronic gout, elbowHeader
- M1A.03Idiopathic chronic gout, wristHeader
- M1A.04Idiopathic chronic gout, handHeader
- M1A.05Idiopathic chronic gout, hipHeader
- M1A.06Idiopathic chronic gout, kneeHeader
- M1A.07Idiopathic chronic gout, ankle and footHeader
- M1A.08Idiopathic chronic gout, vertebrae7th char needed
- M1A.09Idiopathic chronic gout, multiple sites7th char needed