O26.0 vs R63.5
O26.0 (Excessive weight gain in pregnancy) compared with R63.5 (Abnormal weight gain), 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. R63.5 carries an Excludes1 note covering O26.0: “excessive weight gain in pregnancy (O26.0-)”
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
| O26.0Excessive weight gain in pregnancy | R63.5Abnormal weight gain | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A) | R00-R99 — Symptoms, Signs and Abnormal Clinical and Laboratory Findings, Not Elsewhere Classified (R00-R99) |
| Definition | Excessive weight gain in pregnancy is a non-billable ICD-10-CM category code (O26.0). | Abnormal weight gain is a billable ICD-10-CM diagnosis code (R63.5). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources