2027 ICD-10-CM Diagnosis Code O68Labor and delivery complicated by abnormality of fetal acid-base balance
ICD-10-CM Codes›O00-O9A›O60-O77›O68
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
O68 is a billable ICD-10-CM diagnosis code for labor and delivery complicated by abnormality of fetal acid-base balance. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 998. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 3 closely related codes. The code is restricted by the Medicare Code Editor to maternity cases (age 9 through 64). Coders also document this condition as antepartum fetal acidosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Malposition, disproportion or other labor complications.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for O68.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Antepartum fetal acidosis
- Fetal acidosis
- Fetal metabolic disorder
- Intrapartum fetal acidosis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to O68: its own notes plus those printed at Chapter 15. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Fetal acidemia complicating labor and delivery
- Fetal acidosis complicating labor and delivery
- Fetal alkalosis complicating labor and delivery
- Fetal metabolic acidemia complicating labor and delivery
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- supervision of normal pregnancy (Z34.-)
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
Notes
General instructions on how these codes are used.
- CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
- 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)
- Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
- 1st trimester- less than 14 weeks 0 days
- 2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
- 3rd trimester- 28 weeks 0 days until delivery
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name O68, its category, or a range that includes it.
Excludes1 4
These codes carry an Excludes1 note naming O68: they are not reported together with it, unless the two conditions are unrelated.
- O77.8 Labor and delivery complicated by other evidence of fetal stressabnormality of fetal acid-base balance (O68)
- O77.8 Labor and delivery complicated by other evidence of fetal stressfetal metabolic acidemia (O68)
- O77.9 Labor and delivery complicated by fetal stress, unspecifiedabnormality of fetal acid-base balance (O68)
- O77.9 Labor and delivery complicated by fetal stress, unspecifiedfetal metabolic acidemia (O68)
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Pregnancy (single) (uterine) See Also: Delivery and Puerperal; Z33.1
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Childbirth Problems
Childbirth is the process of giving birth to a baby. It includes labor and delivery. Usually everything goes well, but problems can happen. They may cause a risk to the mother, baby, or both. Some of the more common childbirth problems include:
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert O68 to ICD-9-CMHistory
Code HistoryHistory
Questions About O68Overview
Is O68 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report labor and delivery complicated by abnormality of fetal acid-base balance on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does O68 group to?
When labor and delivery complicated by abnormality of fetal acid-base balance is the principal diagnosis on an inpatient stay, it groups to MS-DRG 998 (principal Diagnosis Invalid as Discharge Diagnosis), which carries a relative weight of 0. Higher weights mean higher Medicare reimbursement.
Is O68 a CC or MCC?
CMS lists O68 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 3 closely related codes in its exclusion list.
Who can O68 be reported for?
The Medicare Code Editor checks labor and delivery complicated by abnormality of fetal acid-base balance against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.
Can O68 be reported with O77.9?
Not as a rule. The Excludes1 note on O68 lists "fetal stress NOS (O77.9)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
