2027 ICD-10-CM Diagnosis Code O99.835Other infection carrier state complicating the puerperium
ICD-10-CM Codes›O00-O9A›O94-O9A›O99
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
O99.835 is a billable ICD-10-CM diagnosis code for other infection carrier state complicating the puerperium. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 769, 776. 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 36 closely related codes. 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 Carrier status and Complications specified during the puerperium.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for O99.835.
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to O99.835: its own notes plus those printed at O99.83, O99.8, O99, 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.
- conditions which complicate the pregnant state, are aggravated by the pregnancy or are a main reason for obstetric care
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.
- genitourinary infections in pregnancy (O23.-)
- infection of genitourinary tract following delivery (O86.1-O86.4)
- malignant neoplasm complicating pregnancy, childbirth and the puerperium (O9A.1-)
- maternal care for known or suspected abnormality of maternal pelvic organs (O34.-)
- postpartum acute kidney failure (O90.49)
- traumatic injuries in pregnancy (O9A.2-)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code to identify the carrier state (Z22.-)
- code to identify condition
- code to identify specific 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 O99.835, its category, or a range that includes it.
Excludes2 1
These codes carry an Excludes2 note naming O99.835: its condition is not part of those codes, and both may be reported when the patient has both.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Infections and Pregnancy
During pregnancy, some common infections such as the common cold or a skin infection do not usually cause serious problems. Some infections, such as the flu, can be more severe when you're pregnant. But other infections can be harmful to you, your fetus, or both.
The full article covers:
- How can infections affect your pregnancy?
- What infections can be harmful during pregnancy?
- What are the symptoms of an infection during pregnancy?
- What are the treatments for infections during pregnancy?
- Can infections during pregnancy be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert O99.835 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About O99.835Overview
What is the ICD-10 code for other infection carrier state complicating the puerperium?
The ICD-10-CM code for other infection carrier state complicating the puerperium is O99.835 (sometimes written as O99835). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is O99.835 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other infection carrier state complicating the puerperium on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does O99.835 group to?
When other infection carrier state complicating the puerperium is the principal diagnosis on an inpatient stay, it groups to MS-DRG 769, 776, with relative weights from 0.6718 to 1.6666 depending on complications. Higher weights mean higher Medicare reimbursement.
Is O99.835 a CC or MCC?
CMS lists O99.835 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 36 closely related codes in its exclusion list.
Who can O99.835 be reported for?
The Medicare Code Editor checks other infection carrier state complicating the puerperium against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.
