O31.8X91 vs O31.8X93
O31.8X91 (Other complications specific to multiple gestation, unspecified trimester, fetus 1) compared with O31.8X93 (Other complications specific to multiple gestation, unspecified trimester, fetus 3), from the official CMS tabular data.
Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources
Summary
No tabular note links these codes. Both belong to category O31, and nothing in the tabular list prevents reporting each when it is documented.
Registry fact- What is different?
Title wording.The titles differ in one word, “1” (O31.8X91) versus “3” (O31.8X93): O31.8X91 is “Other complications specific to multiple gestation, unspecified trimester, fetus 1”; O31.8X93 is “Other complications specific to multiple gestation, unspecified trimester, fetus 3”.
Registry fact
- Can these codes be reported together?
No instruction prevents it.No note in either entry names the other. Both belong to category O31; each may be reported when its own documentation is present.
Registry fact
- Is there an Excludes1 relationship?
None.Neither entry carries an Excludes1 note that names the other code.
Official rule
- Is there an Excludes2 relationship?
None.Neither entry carries an Excludes2 note that names the other code. O31.8X91 carries 3 Excludes2 notes and O31.8X93 carries 3 Excludes2 notes covering other codes; the side-by-side table quotes them.
Official rule
- Is one more specific?
No.Both titles are unspecified forms within category O31, and neither is a subdivision of the other.
Registry fact
- Is one a parent or header code?
No.Both are billable codes, and neither contains the other.
Registry fact
- Are there sequencing instructions?
None.Neither entry carries a Code First or Use Additional Code note that names the other.
Official rule
- Are there other coding relationships?
None found.No laterality, encounter-phase, Table of Neoplasms, Table of Drugs and Chemicals, or history-versus-active-disease relationship links these codes.
MedCoder-derived
Official rule: a tabular instructional note or a section of the ICD-10-CM Official Guidelines, quoted as published. Registry fact: the codes’ own published attributes (titles, billable status, position in the hierarchy, code set). MedCoder-derived: a reading MedCoder computes from those facts; it is not itself a rule. How to read the labels
Can these codes be reported together?
Yes, when each is documented. O31.8X91 and O31.8X93 both belong to category O31.
No Excludes1/Excludes2 relationship exists between these codes in the official tabular list. The code titles state what each one covers, and the documentation decides which applies.
Side by side
Similar descriptions do not make codes interchangeable. The documentation and the official instructions decide which code applies.
Other complications specific to multiple gestation, unspecified trimester, fetus 1
Other complications specific to multiple gestation, unspecified trimester, fetus 3
- delayed delivery of second twin, triplet, etc. (O63.2)
- malpresentation of one fetus or more (O32.9)
- placental transfusion syndromes (O43.0-)
O31 Complications specific to multiple gestation
O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A)
- One of the following 7th characters is to be assigned to each code under category O31. 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 O31 that has a 7th character of 1 through 9.
No Excludes1, Code first, Use additional code, Code also and Includes note at either code.
Notes are the code’s own tabular entry, quoted as published. A note that names the other code is the one the verdict above rests on. In a row that differs, notes every code shares are dimmed.
Derived from the official CMS ICD-10-CM tabular data (FY2027). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources