M1A.469
Other secondary chronic gout, unspecified knee
Not billable — category only FY2026 2025-10-01 → 2026-09-30
This is the unspecified option. 2 more
specific codes sit alongside it. Worth
checking whether the documentation supports one of them.
Exclusions 12 never code together
M00-M99chapter
Excludes2
- arthropathic psoriasis (L40.5-)L40.5-
- certain conditions originating in the perinatal period (P04-P96)P04-P96
- certain infectious and parasitic diseases (A00-B99)A00-B99
- compartment syndrome (traumatic) (T79.A-)T79.A-
- complications of pregnancy, childbirth and the puerperium (O00-O9A)O00-O9A
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Q00-Q99
- endocrine, nutritional and metabolic diseases (E00-E88)E00-E88
- injury, poisoning and certain other consequences of external causes (S00-T88)S00-T88
- neoplasms (C00-D49)C00-D49
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)R00-R94
Excludes1 — never code together. The excluded condition and this one are mutually exclusive.
Excludes2 — not included here, but the patient may have both. Code both when documented.
7th character 2
0 without tophus (tophi)
1 with tophus (tophi)
Instructional notes 10
M1Acode
Use additional code
- code to identify:
- Autonomic neuropathy in diseases classified elsewhere (G99.0)G99.0
- Calculus of urinary tract in diseases classified elsewhere (N22)N22
- Cardiomyopathy in diseases classified elsewhere (I43)I43
- Disorders of external ear in diseases classified elsewhere (H61.1-, H62.8-)H61.1-H62.8-
- Disorders of iris and ciliary body in diseases classified elsewhere (H22)H22
- Glomerular disorders in diseases classified elsewhere (N08)N08
M1A.4code
Code first
- associated condition
M00-M25block
Includes
- Disorders affecting predominantly peripheral (limb) joints
M00-M99chapter
Notes
- Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
Alongside this code 2 same parent — M1A.46
Subordinate codes 2
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.