2027 ICD-10-CM Diagnosis Code O10.313Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, third trimester

ICD-10-CM Codes›O00-O9A›O10-O16›O10

ICD-10-CM O10.313
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

O10.313 is a billable ICD-10-CM diagnosis code for pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, third 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 Hypertension and hypertensive-related conditions complicating pregnancy; childbirth; and the puerperium and Hypertension with complications and secondary hypertension.

Code Identity

ICD-10-CM Code
O10.313
Billable Status
Yes — Valid for Submission
Code Describes
Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, third trimester
Short Description
Pre-exist hyp heart and chr kidney dis comp preg, third tri
Parent Code
O10.31
Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO10-O16Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium
CategoryO10Pre-existing hypertension complicating pregnancy, childbirth and the puerperium
This CodeO10.313Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, third trimester

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O10.313.

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 O10.313: its own notes plus those printed at O10.3, O10, and Chapter 15. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From O10 Pre-existing hypertension complicating pregnancy, childbirth and the puerperium applies to 36 codes
  • pre-existing hypertension with pre-existing proteinuria complicating pregnancy, childbirth and the puerperium

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 O10 Pre-existing hypertension complicating pregnancy, childbirth and the puerperium applies to 36 codes
  • pre-existing hypertension with superimposed pre-eclampsia complicating pregnancy, childbirth and the puerperium (O11.-)
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 O10.3 Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, childbirth and the puerperium applies to 6 codes
  • code from I13 to identify the type of hypertensive heart and chronic kidney disease
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 O10.313, its category, or a range that includes it.

Includes 2

These notes mention O10.313.

  • O11 Pre-existing hypertension with pre-eclampsia
    conditions in O10 complicated by pre-eclampsia names O10, which includes this code
  • O15 Eclampsia
    convulsions following conditions in O10-O14 and O16 names O10-O14, which includes this code

Applicable To 1

These notes mention O10.313.

  • P00.0 Newborn affected by maternal hypertensive disorders
    Newborn affected by maternal conditions classifiable to O10-O11, O13-O16 names O10-O11, which includes this code

Excludes1 1

These codes carry an Excludes1 note naming O10.313: they are not reported together with it, unless the two conditions are unrelated.

  • I10 Essential (primary) hypertension
    hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16) names O10-O11, which includes this code

Excludes2 2

These codes carry an Excludes2 note naming O10.313: its condition is not part of those codes, and both may be reported when the patient has both.

  • Block I10-I1A Hypertensive diseases
    hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16) names O10-O11, which includes this code
  • O99.4 Diseases of the circulatory system complicating pregnancy, childbirth and the puerperium
    hypertensive disorders (O10-O16) names O10-O16, which includes this code

Use Additional Code 1

These codes say to use an additional code from the note, and O10.313 is one of the codes named.

  • O11 Pre-existing hypertension with pre-eclampsia
    code from O10 to identify the type of hypertension names O10, which includes this code

Clinical ClassificationClinical

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

CCSR PRG020
Hypertension and hypertensive-related conditions complicating pregnancy; childbirth; and the puerperium
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR CIR008
Hypertension with complications and secondary hypertension
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Chronic Kidney Disease

You have two kidneys, each about the size of your fist. Their main job is to filter your blood. They remove wastes and extra water, which become urine. They also keep the body's chemicals balanced, help control blood pressure, and make hormones.

Read the full article at MedlinePlus

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

Convert O10.313 to ICD-9-CMHistory

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

ICD-9-CM
642.21 Old hyperten NEC-deliver
Approximate The match is approximate rather than exact.
ICD-9-CM
642.23 Old hyperten NEC-antepar
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 O10.313Overview

Is O10.313 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, third trimester on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does O10.313 group to?

When pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, third 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 O10.313 be reported for?

The Medicare Code Editor checks pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, third trimester against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.

Does O10.313 need an additional code?

When the condition applies, yes. The Use Additional Code note at O10.3, which applies to O10.313, reads: code from I13 to identify the type of hypertensive heart and chronic kidney disease. The additional code is reported after O10.313.

What is the ICD-9 equivalent of O10.313?

Under the General Equivalence Mappings, pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, third trimester converts to ICD-9-CM 642.21 (old hyperten NEC-deliver) and 642.23 (old hyperten NEC-antepar). The mapping is approximate, so confirm the match fits the documentation.