O40 — Polyhydramnios
Is O40 billable?
No — O40 is a non-billable header code. O40 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 28 billable codes beneath O40.
Billable codes under this header
- O40.1XX0Polyhydramnios, first trimester, not applicable or unspecified
- O40.1XX1Polyhydramnios, first trimester, fetus 1
- O40.1XX2Polyhydramnios, first trimester, fetus 2
- O40.1XX3Polyhydramnios, first trimester, fetus 3
- O40.1XX4Polyhydramnios, first trimester, fetus 4
- O40.1XX5Polyhydramnios, first trimester, fetus 5
- O40.1XX9Polyhydramnios, first trimester, other fetus
- O40.2XX0Polyhydramnios, second trimester, not applicable or unspecified
- O40.2XX1Polyhydramnios, second trimester, fetus 1
- O40.2XX2Polyhydramnios, second trimester, fetus 2
- O40.2XX3Polyhydramnios, second trimester, fetus 3
- O40.2XX4Polyhydramnios, second trimester, fetus 4
- O40.2XX5Polyhydramnios, second trimester, fetus 5
- O40.2XX9Polyhydramnios, second trimester, other fetus
- O40.3XX0Polyhydramnios, third trimester, not applicable or unspecified
- O40.3XX1Polyhydramnios, third trimester, fetus 1
- O40.3XX2Polyhydramnios, third trimester, fetus 2
- O40.3XX3Polyhydramnios, third trimester, fetus 3
- O40.3XX4Polyhydramnios, third trimester, fetus 4
- O40.3XX5Polyhydramnios, third trimester, fetus 5
- O40.3XX9Polyhydramnios, third trimester, other fetus
- O40.9XX0Polyhydramnios, unspecified trimester, not applicable or unspecified
- O40.9XX1Polyhydramnios, unspecified trimester, fetus 1
- O40.9XX2Polyhydramnios, unspecified trimester, fetus 2
- O40.9XX3Polyhydramnios, unspecified trimester, fetus 3
- O40.9XX4Polyhydramnios, unspecified trimester, fetus 4
- O40.9XX5Polyhydramnios, unspecified trimester, fetus 5
- O40.9XX9Polyhydramnios, unspecified trimester, other fetus
O40 at a glance
| Code | O40 |
|---|---|
| Description | Polyhydramnios |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
How is O40 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to O40. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Pregnancy › complicated by › polyhydramnios (single) (uterine)
Excludes1 — never code together
The conditions below can never be reported together with O40 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- encounter for suspected maternal and fetal conditions ruled out (Z03.7-)
Includes
Conditions classified to O40.
- hydramnios
Excludes1 — never code together — inherited from Chapter 15
The conditions below can never be reported together with O40 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.-)
Use additional code — inherited from Chapter 15
Report an additional code alongside O40 to fully describe the condition. O40 is sequenced first.
- code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
Excludes2 — not included here — inherited from Chapter 15
The conditions below are not part of O40, but a patient may have both at the same time. When documentation supports it, O40 and the excluded code may both be reported.
What codes fall under O40? (4)
How long has O40 existed?
O40 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 O40?
ICD-10-CM declares these codes mutually exclusive with O40 — exactly one of each pair can be correct for a given encounter.