M1A.4
Other secondary chronic gout
M1A.4 is a non-billable ICD-10-CM code header for other secondary 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.40 Other secondary chronic gout, unspecified site; M1A.41 Other secondary chronic gout, shoulder; M1A.42 Other secondary chronic gout, elbow; M1A.43 Other secondary chronic gout, wrist and 6 more. Its coding notes include a Code first instruction, 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)
Code first
If the underlying condition listed here is present and known, sequence it first.
- associated condition
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)
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.4 10
- M1A.40Other secondary chronic gout, unspecified site7th char needed
- M1A.41Other secondary chronic gout, shoulderHeader
- M1A.42Other secondary chronic gout, elbowHeader
- M1A.43Other secondary chronic gout, wristHeader
- M1A.44Other secondary chronic gout, handHeader
- M1A.45Other secondary chronic gout, hipHeader
- M1A.46Other secondary chronic gout, kneeHeader
- M1A.47Other secondary chronic gout, ankle and footHeader
- M1A.48Other secondary chronic gout, vertebrae7th char needed
- M1A.49Other secondary chronic gout, multiple sites7th char needed