O01.9 — Hydatidiform mole, unspecified
Is O01.9 billable?
Yes, but O01.9 is an unspecified code. O01.9 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, O01.9 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting O01.9 — the more specific alternatives are listed below.
More specific alternatives
O01.9 at a glance
| Code | O01.9 |
|---|---|
| Description | Hydatidiform mole, unspecified |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does O01.9 group to?
O01.9 sits in MDC 14 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 817Other Antepartum Diagnoses with O.R. Procedures with MCCsurgical
- 818Other Antepartum Diagnoses with O.R. Procedures with CCsurgical
- 819Other Antepartum Diagnoses with O.R. Procedures without CC/MCCsurgical
How is O01.9 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to O01.9. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Hydatidiform mole (benign) (complicating pregnancy) (delivered) (undelivered)
- Trophoblastic disease
- Mole › hydatid, hydatidiform (pigmented)
- Pregnancy › complicated by › hydatidiform mole (single) (uterine)
- Pregnancy › molar NEC › hydatidiform (single) (uterine)
Inclusion terms
Alternative wording in documentation that is classified to O01.9.
- Trophoblastic disease NOS
- Vesicular mole NOS
Excludes1 — never code together — inherited from Chapter 15
The conditions below can never be reported together with O01.9 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- supervision of normal pregnancy (Z34.-)
Excludes1 — never code together — inherited from O00-O08
The conditions below can never be reported together with O01.9 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Excludes1 — never code together — inherited from O01
The conditions below can never be reported together with O01.9 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Use additional code — inherited from Chapter 15
Report an additional code alongside O01.9 to fully describe the condition. O01.9 is sequenced first.
- code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
Use additional code — inherited from O01
Report an additional code alongside O01.9 to fully describe the condition. O01.9 is sequenced first.
- code from category O08 to identify any associated complication.
Excludes2 — not included here — inherited from Chapter 15
The conditions below are not part of O01.9, but a patient may have both at the same time. When documentation supports it, O01.9 and the excluded code may both be reported.
How long has O01.9 existed?
O01.9 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with O01.9?
ICD-10-CM declares these codes mutually exclusive with O01.9 — exactly one of each pair can be correct for a given encounter.