2026 ICD-10-CM Diagnosis Code O99.519Diseases of the respiratory system complicating pregnancy, unspecified trimester
ICD-10-CM Codes›O00-O9A›O94-O9A›O99
- Billable — Valid for Submission
- Not Chronic
O99.519 is a billable ICD-10-CM diagnosis code for diseases of the respiratory system complicating pregnancy, unspecified trimester. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) 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). Coders also document this condition as asthma in pregnancy. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified complications in pregnancy.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for O99.519.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Asthma in pregnancy
- Fetal disorder due to chronic maternal respiratory disease
- Fetal disorder due to maternal respiratory disease
- Rhinitis of pregnancy
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Breathing Problems
When you're short of breath, it's hard or uncomfortable for you to take in the oxygen your body needs. You may feel as if you're not getting enough air. Sometimes you can have mild breathing problems because of a stuffy nose or intense exercise. But shortness of breath can also be a sign of a serious disease.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert O99.519 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About O99.519Overview
Is O99.519 (Diseases of the respiratory system complicating pregnancy) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report diseases of the respiratory system complicating pregnancy, unspecified trimester on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does O99.519 group to?
When diseases of the respiratory system complicating pregnancy, unspecified trimester is the principal diagnosis on an inpatient stay, it groups to MS-DRG 817, 818, 819, 831, 832, 833, with relative weights from 0.5229 to 1.6880 depending on complications. Higher weights mean higher Medicare reimbursement.
Who can O99.519 be reported for?
The Medicare Code Editor checks diseases of the respiratory system complicating pregnancy, unspecified 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 O99.519?
Under the General Equivalence Mappings, diseases of the respiratory system complicating pregnancy, unspecified trimester converts to ICD-9-CM 648.90 (oth curr cond preg-unsp). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
