2026 ICD-10-CM Diagnosis Code P28.0Primary atelectasis of newborn

ICD-10-CM Codes›P00–P96›P19-P29›P28

ICD-10-CM P28.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

P28.0 is a billable ICD-10-CM diagnosis code for primary atelectasis of newborn. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as perinatal atelectasis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Respiratory perinatal condition.

Code Identity

ICD-10-CM Code
P28.0
Billable Status
Yes — Valid for Submission
Code Describes
Primary atelectasis of newborn
Short Description
Primary atelectasis of newborn
Same as the full description in the CMS dataset.
Parent Code
P28
Other respiratory conditions originating in the perinatal period

Code Classification

ChapterP00–P96Certain conditions originating in the perinatal period
SectionP19-P29Respiratory and cardiovascular disorders specific to the perinatal period
CategoryP28Other respiratory conditions originating in the perinatal period
This CodeP28.0Primary atelectasis of newborn

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Perinatal atelectasis
  • Primary atelectasis, in perinatal period
  • Pulmonary hypoplasia associated with short gestation

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Primary failure to expand terminal respiratory units
  • Pulmonary hypoplasia associated with short gestation
  • Pulmonary immaturity NOS

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Apneumatosis, newborn
    • Atelectasis(massive) (partial) (pressure) (pulmonary)
      • newborn
        • primary
    • Atelectasis(massive) (partial) (pressure) (pulmonary)
      • primary (newborn)
    • Failure, failed
      • expansion terminal respiratory units (newborn) (primary)
    • Fetus, fetal
      • lung tissue
    • Hypoplasia, hypoplastic
      • lung (lobe) (not associated with short gestation)
        • associated with immaturity, low birth weight, prematurity, or short gestation
    • Hypoplasia, hypoplastic
      • pulmonary (not associated with short gestation)
        • associated with short gestation
    • Immaturity(less than 37 completed weeks)
      • lung, newborn
    • Immaturity(less than 37 completed weeks)
      • pulmonary, newborn
    • Inadequate, inadequacy
      • development
        • lungs
          • associated with short gestation
    • Nonexpansion, lung(newborn)
    • Nonpneumatization, lung NEC
    • Premature
      • lungs

Clinical ClassificationClinical

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

CCSR PNL006
Respiratory perinatal condition
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Lung Diseases

When you breathe, your lungs take in oxygen from the air and deliver it to the bloodstream. The cells in your body need oxygen to work and grow. During a normal day, you breathe nearly 25,000 times. People with lung disease have difficulty breathing. Millions of people in the U.S. have lung disease.

Read the full article at MedlinePlus

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

Convert P28.0 to ICD-9-CMHistory

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

ICD-9-CM
770.4 Primary atelectasis
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About P28.0Overview

Is P28.0 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report primary atelectasis of newborn on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of P28.0?

Under the General Equivalence Mappings, primary atelectasis of newborn converts to ICD-9-CM 770.4 (primary atelectasis). The mapping is a direct match.

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.