O41.01 is the authoritative medical code for Oligohydramnios, first trimester. This classification is used in medical billing and clinical recording to specify the clinical criteria for oligohydramnios, first trimester (ICD-10-CM O41.01), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.
Official Registry Overview & Definition
Oligohydramnios, first trimester is a non-billable ICD-10-CM category code O41.01. A more specific billable subcode must be selected for claims submission. Excludes1 (not coded here): encounter for suspected maternal and fetal conditions ruled out Z03.7-. 7th character: One of the following 7th characters is to be assigned to each code under category O41. 7th character 0 is for single gestations and multiple gestations where the fetus is unspecified. 7th characters 1 through 9 are for cases of multiple gestations to identify the fetus for which the code applies. The appropriate code from category O30, Multiple gestation, must also be assigned when assigning a code from category O41 that has a 7th character of 1 through 9..
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for O41.01 in the official ICD-10-CM tabular list.
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- encounter for suspected maternal and fetal conditions ruled out Z03.7-
Frequently Asked Questions (FAQ) & Clinical Guidance
Can O41.01 be billed directly?
No. O41.01 (Oligohydramnios, first trimester) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.
Does O41.01 require a 7th character?
Yes. One of the following 7th characters is to be assigned to each code under category O41. 7th character 0 is for single gestations and multiple gestations where the fetus is unspecified. 7th characters 1 through 9 are for cases of multiple gestations to identify the fetus for which the code applies. The appropriate code from category O30, Multiple gestation, must also be assigned when assigning a code from category O41 that has a 7th character of 1 through 9..
What can't be coded together with O41.01?
Per Excludes1 instructions, O41.01 must not be reported with: encounter for suspected maternal and fetal conditions ruled out (Z03.7-).
Codes in This Family (40)
Official ICD-10-CM classifications in the same code family as O41.01, with their registry titles.
- O41 — Other disorders of amniotic fluid and membranes
- O41.0 — Oligohydramnios
- O41.00 — Oligohydramnios, unspecified trimester
- O41.000 — Oligohydramnios, unspecified trimester, not applicable or unspecified
- O41.001 — Oligohydramnios, unspecified trimester, fetus 1
- O41.002 — Oligohydramnios, unspecified trimester, fetus 2
- O41.003 — Oligohydramnios, unspecified trimester, fetus 3
- O41.004 — Oligohydramnios, unspecified trimester, fetus 4
- O41.005 — Oligohydramnios, unspecified trimester, fetus 5
- O41.009 — Oligohydramnios, unspecified trimester, other fetus
- O41.00X0 — Oligohydramnios, unspecified trimester, not applicable or unspecified
- O41.00X1 — Oligohydramnios, unspecified trimester, fetus 1
- O41.00X2 — Oligohydramnios, unspecified trimester, fetus 2
- O41.00X3 — Oligohydramnios, unspecified trimester, fetus 3
- O41.00X4 — Oligohydramnios, unspecified trimester, fetus 4
- O41.00X5 — Oligohydramnios, unspecified trimester, fetus 5
- O41.00X9 — Oligohydramnios, unspecified trimester, other fetus
- O41.010 — Oligohydramnios, first trimester, not applicable or unspecified
- O41.011 — Oligohydramnios, first trimester, fetus 1
- O41.012 — Oligohydramnios, first trimester, fetus 2
- O41.013 — Oligohydramnios, first trimester, fetus 3
- O41.014 — Oligohydramnios, first trimester, fetus 4
- O41.015 — Oligohydramnios, first trimester, fetus 5
- O41.019 — Oligohydramnios, first trimester, other fetus
- O41.01X0 — Oligohydramnios, first trimester, not applicable or unspecified
- O41.01X1 — Oligohydramnios, first trimester, fetus 1
- O41.01X2 — Oligohydramnios, first trimester, fetus 2
- O41.01X3 — Oligohydramnios, first trimester, fetus 3
- O41.01X4 — Oligohydramnios, first trimester, fetus 4
- O41.01X5 — Oligohydramnios, first trimester, fetus 5
- O41.01X9 — Oligohydramnios, first trimester, other fetus
- O41.02 — Oligohydramnios, second trimester
- O41.020 — Oligohydramnios, second trimester, not applicable or unspecified
- O41.021 — Oligohydramnios, second trimester, fetus 1
- O41.022 — Oligohydramnios, second trimester, fetus 2
- O41.023 — Oligohydramnios, second trimester, fetus 3
- O41.024 — Oligohydramnios, second trimester, fetus 4
- O41.025 — Oligohydramnios, second trimester, fetus 5
- O41.029 — Oligohydramnios, second trimester, other fetus
- O41.02X0 — Oligohydramnios, second trimester, not applicable or unspecified
Related Codes & Numerical Sequence (Crawl Map)
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures:
ICD Code O42.01
Preterm premature rupture of membranes, onset of labor within 24 hours of rupture
ICD Code O44.01
Complete placenta previa NOS or without hemorrhage, first trimester