O31.40X1 — Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, fetus 1
Is O31.40X1 billable?
Yes, but O31.40X1 is an unspecified code. O31.40X1 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, O31.40X1 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 O31.40X1 — the more specific alternatives are listed below.
More specific alternatives
- O31.41X1Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester, fetus 1
- O31.42X1Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, fetus 1
- O31.43X1Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 1
O31.40X1 at a glance
| Code | O31.40X1 |
|---|---|
| Description | Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, fetus 1 |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "1" | fetus 1 |
| FY2027 change | New in FY2027 |
What does the 7th character "1" mean in O31.40X1?
In O31.40X1, the 7th character 1 means fetus 1. The 7th character is required for O31.40X1 to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does O31.40X1 group to?
O31.40X1 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 O31.40X1 listed in the Alphabetic Index?
The Alphabetic Index lists these routes under O31.4, the nearest indexed parent of O31.40X1. Use them to find the family, then select the specific code.
- Syndrome › vanishing twin of one fetus or more
- Pregnancy › continuing following › vanishing twin syndrome of one fetus or more (single) (uterine)
Excludes1 — never code together — inherited from Chapter 15
The conditions below can never be reported together with O31.40X1 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 O31.40X1 to fully describe the condition. O31.40X1 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 O31.40X1, but a patient may have both at the same time. When documentation supports it, O31.40X1 and the excluded code may both be reported.
Excludes2 — not included here — inherited from O31
The conditions below are not part of O31.40X1, but a patient may have both at the same time. When documentation supports it, O31.40X1 and the excluded code may both be reported.