New for FY2027 ICD-10-CM · October 1, 2026
O00.31: Cesarean scar ectopic pregnancy without intrauterine pregnancy
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Cesarean scar ectopic pregnancy without intrauterine pregnancy. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Billable code. Verified against the official FY2027 order file.
FY2027 Tabular instructions
Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.
Instructional note
CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
Source: O00-O9A (chapter, inherited).
Instructional note
Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
Source: O00-O9A (chapter, inherited).
Instructional note
Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
Source: O00-O9A (chapter, inherited).
Instructional note
1st trimester- less than 14 weeks 0 days
Source: O00-O9A (chapter, inherited).
Instructional note
2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
Source: O00-O9A (chapter, inherited).
Instructional note
3rd trimester- 28 weeks 0 days until delivery
Source: O00-O9A (chapter, inherited).
Instructional note
code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
Source: O00-O9A (chapter, inherited).
Excludes1
supervision of normal pregnancy (Z34.-)
Source: O00-O9A (chapter, inherited).
Excludes2
mental and behavioral disorders associated with the puerperium (F53.-)
Source: O00-O9A (chapter, inherited).
Excludes2
obstetrical tetanus (A34)
Source: O00-O9A (chapter, inherited).
Excludes2
postpartum necrosis of pituitary gland (E23.0)
Source: O00-O9A (chapter, inherited).
Excludes2
puerperal osteomalacia (M83.0)
Source: O00-O9A (chapter, inherited).
Excludes1
continuing pregnancy in multiple gestation after abortion of one fetus or more (O31.1-, O31.3-)
Source: O00-O08 (section, inherited).
Includes
ruptured ectopic pregnancy
Source: O00 (category, inherited).
Instructional note
code from category O08 to identify any associated complication
Source: O00 (category, inherited).
Compare the FY2027 additions, removals and billable-status changes
What does O00.31 mean in FY2027?
The official ICD-10-CM descriptor is Cesarean scar ectopic pregnancy without intrauterine pregnancy. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
When did O00.31 become an ICD-10-CM code?
O00.31 is new for FY2027 ICD-10-CM, effective October 1, 2026. It is absent from the FY2026 April order file. Use the code set that applies to the encounter or inpatient discharge date, and check the official Tabular instructions.
Is O00.31 billable in FY2027?
The FY2027 order file marks O00.31 as billable. Check the complete Tabular instructions and documentation before assigning it.
Does O00.31 map to an HCC?
CMS has not yet published a risk-model mapping for this new FY2027 code. No HCC category or RAF coefficient is shown.
Source: CMS FY2027 ICD-10-CM order file. Read the FY2027 Official Guidelines.