2027 ICD-10-CM Diagnosis Code P24.31Neonatal aspiration of milk and regurgitated food with respiratory symptoms
ICD-10-CM Codes›P00–P96›P19-P29›P24
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- Not Chronic
P24.31 is a billable ICD-10-CM diagnosis code for neonatal aspiration of milk and regurgitated food with respiratory symptoms. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 791, 793. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 68 closely related codes. Coders also document this condition as aspirated gastric contents in lower respiratory tract. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Respiratory perinatal condition.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Aspirated gastric contents in lower respiratory tract
- Aspiration into trachea
- Aspiration of gastric contents into bronchus
- Aspiration of gastric contents into larynx
- Aspiration of gastric contents into nasopharynx
- Aspiration of gastric contents into pharynx
- Aspiration of gastric contents into respiratory tract
- Aspiration of gastric contents into trachea
- Aspiration pneumonitis caused by regurgitated food
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to P24.31: its own notes plus those printed at P24 and Chapter 16. 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.
- aspiration in utero and during delivery
- conditions that have their origin in the fetal or perinatal period (before birth through the first 28 days after birth) even if morbidity occurs later
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Neonatal aspiration of milk and regurgitated food with pneumonia
- Neonatal aspiration of milk and regurgitated food with pneumonitis
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.
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code to identify any secondary pulmonary hypertension, if applicable (I27.2-)
Notes
General instructions on how these codes are used.
- Codes from this chapter are for use on newborn records only, never on maternal records
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name P24.31, its category, or a range that includes it.
Excludes1 3
These codes carry an Excludes1 note naming P24.31: they are not reported together with it, unless the two conditions are unrelated.
- J18 Pneumonia, unspecified organismneonatal aspiration pneumonia (P24.-) names P24.-, which includes this code
- J69 Pneumonitis due to solids and liquidsneonatal aspiration syndromes (P24.-) names P24.-, which includes this code
- P23 Congenital pneumonianeonatal pneumonia resulting from aspiration (P24.-) names P24.-, which includes this code
Excludes2 2
These codes carry an Excludes2 note naming P24.31: its condition is not part of those codes, and both may be reported when the patient has both.
- Block J09-J18 Influenza and pneumonianeonatal aspiration pneumonia (P24.-) names P24.-, which includes this code
- J12 Viral pneumonia, not elsewhere classifiedneonatal aspiration pneumonia (P24.-) names P24.-, which includes this code
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
milk (newborn) (without respiratory symptoms) P24.30
pneumonia (pneumonitis) P24.31
respiratory symptoms P24.31
vomitus See Also: Foreign body, respiratory tract;
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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 P24.31 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About P24.31Overview
Is P24.31 (Neonatal aspiration of milk and regurgitated food) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report neonatal aspiration of milk and regurgitated food with respiratory symptoms on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does P24.31 group to?
When neonatal aspiration of milk and regurgitated food with respiratory symptoms is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, with relative weights from 4.1073 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.
Is P24.31 a CC or MCC?
CMS lists P24.31 as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 68 closely related codes in its exclusion list.
Does P24.31 need an additional code?
When the condition applies, yes. The Use Additional Code note reads: code to identify any secondary pulmonary hypertension, if applicable (I27.2-). The additional code is reported after P24.31.
What is the ICD-9 equivalent of P24.31?
Under the General Equivalence Mappings, neonatal aspiration of milk and regurgitated food with respiratory symptoms converts to ICD-9-CM 770.86 (stomach cont asp w resp). The mapping is a direct match.
