P28.0 — Primary atelectasis of newborn

BillableCC

Is P28.0 billable?

Yes — P28.0 is billable for FY2027. P28.0 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. P28.0 may be submitted for encounters from October 1, 2026 through September 30, 2027.

P28.0 at a glance

Code	P28.0
Description	Primary atelectasis of newborn
Billable	Yes
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Which MS-DRGs does P28.0 group to?

P28.0 sits in MDC 15 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

791Prematurity with Major Problemsmedical

As a secondary diagnosis, P28.0 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.

How is P28.0 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to P28.0. They show the wording a clinician may have documented, which often differs from the Tabular description.

Apneumatosis, newborn
Nonexpansion, lung (newborn)
Nonpneumatization, lung NEC
Atelectasis › primary (massive) (partial) (pressure) (pulmonary)
Failure, failed › expansion terminal respiratory units
Fetus, fetal › lung tissue
Immaturity › lung, newborn (less than 37 completed weeks)
Immaturity › pulmonary, newborn (less than 37 completed weeks)
Premature › lungs
Atelectasis › newborn › primary (massive) (partial) (pressure) (pulmonary)
Hypoplasia, hypoplastic › lung › associated with immaturity, low birth weight, prematurity, or short gestation
Hypoplasia, hypoplastic › pulmonary › associated with short gestation

Inclusion terms

Alternative wording in documentation that is classified to P28.0.

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

Excludes2 — not included here — inherited from Chapter 16

The conditions below are not part of P28.0, but a patient may have both at the same time. When documentation supports it, P28.0 and the excluded code may both be reported.

congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
endocrine, nutritional and metabolic diseases (E00-E88)
injury, poisoning and certain other consequences of external causes (S00-T88)
neoplasms (C00-D49)
tetanus neonatorum (A33)

Code also — inherited from P28

Two codes may be needed to describe the condition fully. Whether P28.0 is sequenced first depends on the reason for the encounter.

, if applicable, congenital malformations of the respiratory system (Q30-Q34)

How long has P28.0 existed?

P28.0 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.

Which codes are confused with P28.0?

ICD-10-CM declares these codes mutually exclusive with P28.0 — exactly one of each pair can be correct for a given encounter.

vs Q33.6Congenital hypoplasia and dysplasia of lung

Which conditions are coded to P28.0?

ICD-10 code for Atelectasis