O65.4 vs O66.2
O65.4 (Obstructed labor due to fetopelvic disproportion, unspecified) compared with O66.2 (Obstructed labor due to unusually large fetus), 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. O65.4 carries an Excludes1 note covering O66.2: “dystocia due to abnormality of fetus (O66.2-O66.3)”
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
| O65.4Obstructed labor due to fetopelvic disproportion, unspecified | O66.2Obstructed labor due to unusually large fetus | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A) | O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A) |
| Definition | Obstructed labor due to fetopelvic disproportion, unspecified is a billable ICD-10-CM diagnosis code (O65.4). | Obstructed labor due to unusually large fetus is a billable ICD-10-CM diagnosis code (O66.2). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources