O41.1020 — Infection of amniotic sac and membranes, unspecified, second trimester, not applicable or unspecified
Is O41.1020 billable?
Yes, but O41.1020 is an unspecified code. O41.1020 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, O41.1020 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 O41.1020 — the more specific alternatives are listed below.
O41.1020 at a glance
| Code | O41.1020 |
|---|---|
| Description | Infection of amniotic sac and membranes, unspecified, second trimester, not applicable or unspecified |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "0" | not applicable or unspecified |
What does the 7th character "0" mean in O41.1020?
In O41.1020, the 7th character 0 means not applicable or unspecified. The 7th character is required for O41.1020 to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does O41.1020 group to?
O41.1020 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
As a secondary diagnosis, O41.1020 is a major complication or comorbidity (MCC), which can move a stay into a higher-paying DRG.
How is O41.1020 listed in the Alphabetic Index?
The Alphabetic Index lists these routes under O41.10, the nearest indexed parent of O41.1020. Use them to find the family, then select the specific code.
- Infection, infected, infective › amniotic fluid, sac or cavity (opportunistic)
- Pregnancy › complicated by › infection › amniotic fluid or sac (single) (uterine)
Excludes1 — never code together — inherited from Chapter 15
The conditions below can never be reported together with O41.1020 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 O41
The conditions below can never be reported together with O41.1020 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-)
Use additional code — inherited from Chapter 15
Report an additional code alongside O41.1020 to fully describe the condition. O41.1020 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 O41.1020, but a patient may have both at the same time. When documentation supports it, O41.1020 and the excluded code may both be reported.
How long has O41.1020 existed?
O41.1020 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.