2027 ICD-10-CM Diagnosis Code O26.812Pregnancy related exhaustion and fatigue, second trimester

ICD-10-CM Codes›O00-O9A›O20-O29›O26

ICD-10-CM O26.812
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

O26.812 is a billable ICD-10-CM diagnosis code for pregnancy related exhaustion and fatigue, second trimester. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 817 through 819, 831 through 833. The code is restricted by the Medicare Code Editor to maternity cases (age 9 through 64). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified complications in pregnancy.

This medical diagnosis code is frequently used in OB/GYN medical specialties to designate conditions such maternal disorders related to pregnancy.

Code Identity

ICD-10-CM Code
O26.812
Billable Status
Yes — Valid for Submission
Code Describes
Pregnancy related exhaustion and fatigue, second trimester
Short Description
Pregnancy related exhaustion and fatigue, second trimester
Same as the full description in the CMS dataset.
Parent Code
O26.81
Pregnancy related exhaustion and fatigue

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO20-O29Other maternal disorders predominantly related to pregnancy
CategoryO26Maternal care for other conditions predominantly related to pregnancy
This CodeO26.812Pregnancy related exhaustion and fatigue, second trimester

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O26.812.

Maternity diagnoses
The Medicare Code Editor detects inconsistencies in maternity cases by checking a patient's age and any diagnosis on the patient's record. The maternity code edits apply to patients age ange is 9–64 years inclusive (e.g., diabetes in pregnancy, antepartum pulmonary complication).

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to O26.812: its own notes plus those printed at block O20-O29 and Chapter 15. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • 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.

From Block O20-O29 Other maternal disorders predominantly related to pregnancy applies to 260 codes
  • maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48)
  • maternal diseases classifiable elsewhere but complicating pregnancy, labor and delivery, and the puerperium (O98-O99)
From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • mental and behavioral disorders associated with the puerperium (F53.-)
  • obstetrical tetanus (A34)
  • postpartum necrosis of pituitary gland (E23.0)
  • puerperal osteomalacia (M83.0)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • 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.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • 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 O26.812, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming O26.812: they are not reported together with it, unless the two conditions are unrelated.

  • R53.8 Other malaise and fatigue
    exhaustion and fatigue due to pregnancy (O26.8-) names O26.8-, which includes this code
  • Z03.7 Encounter for suspected maternal and fetal conditions ruled out
    known or suspected fetal anomalies affecting management of mother, not ruled out (O26.-, O35.-, O36.-, O40.-, O41.-) names O26.-, which includes this code

Excludes2 1

These codes carry an Excludes2 note naming O26.812: its condition is not part of those codes, and both may be reported when the patient has both.

  • O99.35 Diseases of the nervous system complicating pregnancy, childbirth, and the puerperium
    pregnancy related peripheral neuritis (O26.8-) names O26.8-, which includes this code

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR PRG028
Other specified complications in pregnancy
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Fatigue

Fatigue is a feeling of weariness, tiredness, or lack of energy. It can interfere with your usual daily activities. Fatigue can be a normal response to physical activity, emotional stress, boredom, or lack of sleep. But sometimes it can be a sign of a mental or physical condition.

The full article covers:

  • What is fatigue?
  • What causes fatigue?
  • What can I do to manage fatigue?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert O26.812 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
646.81 Preg compl NEC-delivered
Approximate The match is approximate rather than exact.
ICD-9-CM
646.83 Preg compl NEC-antepart
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About O26.812Overview

What is the ICD-10 code for pregnancy related exhaustion and fatigue, second trimester?

The ICD-10-CM code for pregnancy related exhaustion and fatigue, second trimester is O26.812 (sometimes written as O26812). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is O26.812 (Pregnancy related exhaustion and fatigue) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report pregnancy related exhaustion and fatigue, second trimester on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does O26.812 group to?

When pregnancy related exhaustion and fatigue, second trimester is the principal diagnosis on an inpatient stay, it groups to MS-DRG 833, 832, 831, 819, 818, 817, with relative weights from 0.5000 to 1.7586 depending on complications. Higher weights mean higher Medicare reimbursement.

Who can O26.812 be reported for?

The Medicare Code Editor checks pregnancy related exhaustion and fatigue, second trimester against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.

What is the ICD-9 equivalent of O26.812?

Under the General Equivalence Mappings, pregnancy related exhaustion and fatigue, second trimester converts to ICD-9-CM 646.81 (preg compl NEC-delivered) and 646.83 (preg compl NEC-antepart). The mapping is approximate, so confirm the match fits the documentation.