O01.9 — Hydatidiform mole, unspecified
O01.9 is a billable, specific ICD-10-CM code for hydatidiform mole, unspecified. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Trophoblastic disease NOS
- Vesicular mole NOS
Other codes that can never be billed with O01.9
These codes carry an Excludes1 note pointing at O01.9. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading O01.9 alone.
Risk adjustment
O01.9 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
O01.9 is named in 4 Medicare coverage policies — 4 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A52450Billing and Coding: Paclitaxel (e.g., Taxol®/Abraxane ™)
- A55717Billing and Coding: Lab: Flow Cytometry
- A56464Billing and Coding: Flow Cytometry
- A57689Billing and Coding: Lab: Flow Cytometry
How O01.9 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to O01.9.
- Hydatidiform mole(benign) (complicating pregnancy) (delivered) (undelivered)
- Trophoblastic disease
- Mole›hydatid, hydatidiform(benign) (complicating pregnancy) (delivered) (undelivered)
Related codes at this level
Codes that share O01. If O01.9 is not quite right, the correct code is usually one of these.
Questions about O01.9
- Is O01.9 a billable ICD-10-CM code?
- Yes. O01.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does O01.9 sit in the tabular list?
- Pregnancy, childbirth and the puerperium (O00-O9A), in the block Pregnancy with abortive outcome (O00-O08).