M1A.3521 (Chronic gout due to renal impairment, left hip, with tophus (tophi)) compared with M1A.3591 (Chronic gout due to renal impairment, unspecified hip, with tophus (tophi)), from the official CMS tabular data. M1A.3521 and M1A.3591 code the same condition on opposite sides.
Same condition; these differ only in which side is documented.
These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.
Source: ICD-10-CM tabular list (laterality variant derived from the code title)
Same condition, opposite side. M1A.3521 and M1A.3591 name the same condition on opposite sides of the body.
Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.
| M1A.3521Chronic gout due to renal impairment, left hip, with tophus (tophi) | M1A.3591Chronic gout due to renal impairment, unspecified hip, with tophus (tophi) | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) |
| Definition | Chronic gout due to renal impairment, left hip, with tophus (tophi) is a billable ICD-10-CM diagnosis code (M1A.3521). | Chronic gout due to renal impairment, unspecified hip, with tophus (tophi) is a billable ICD-10-CM diagnosis code (M1A.3591). |
| 7th character | The appropriate 7th character is to be added to each code from category M1A | The appropriate 7th character is to be added to each code from category M1A |
| Use additional code | code to identify: Autonomic neuropathy in diseases classified elsewhere (G99.0) Calculus of urinary tract in diseases classified elsewhere (N22) | code to identify: Autonomic neuropathy in diseases classified elsewhere (G99.0) Calculus of urinary tract in diseases classified elsewhere (N22) |
| Code first | associated renal disease | associated renal disease |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources