M72.8 vs N13.6
M72.8 (Other fibroblastic disorders) compared with N13.6 (Pyonephrosis), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. M72.8 carries an Excludes1 note covering N13.6: “perirenal fasciitis with infection (N13.6)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| M72.8Other fibroblastic disorders | N13.6Pyonephrosis | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) | N00-N99 — Diseases of the Genitourinary System (N00-N99) |
| Definition | Other fibroblastic disorders is a billable ICD-10-CM diagnosis code (M72.8). | Pyonephrosis is a billable ICD-10-CM diagnosis code (N13.6). |
| Includes | Abscess of fascia Fasciitis NEC Other infective fasciitis | pyelonephritis Conditions in N13.0-N13.5 with infection Obstructive uropathy with infection |
| Use additional code | code to (B95.-, B96.-) identify causative organism | code (B95-B97), to identify infectious agent. |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources