2026 ICD-10-CM Diagnosis Code P37.2Neonatal (disseminated) listeriosis
ICD-10-CM Codes›P00–P96›P35-P39›P37
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- Not Chronic
P37.2 is a billable ICD-10-CM diagnosis code for neonatal (disseminated) listeriosis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) 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 188 closely related codes. Coders also document this condition as congenital listeriosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections and Perinatal infections.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Congenital listeriosis
- Disseminated infantile listeriosis
- Food poisoning caused by Listeria monocytogenes
- Infection caused by Listeria
- Invasive listeriosis
- Listeriosis
- Neonatal disseminated listeriosis
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Infection, infected, infective (opportunistic) B99.9
Listeria monocytogenes See Also: Listeriosis;
congenital P37.2
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Listeriosis
infections with bacteria of the genus listeria.Listeria
a genus of bacteria which may be found in the feces of animals and man, on vegetation, and in silage. its species are parasitic on cold-blooded and warm-blooded animals, including man.Invasive Listeriosis
a bacterial infection by listeria monocytogenes in a sterile body compartment.Congenital Listeriosis
a bacterial infection by listeria monocytogenes that is present at birth.
Patient EducationClinical
Listeria Infections
Listeriosis is a foodborne illness caused by Listeria monocytogenes, bacteria found in soil and water. It can be in a variety of raw foods as well as in processed foods and foods made from unpasteurized milk. Listeria is unlike many other germs because it can grow even in the cold temperature of the refrigerator.
Read the full article at MedlinePlus
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Convert P37.2 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About P37.2Overview
What is the ICD-10 code for neonatal (disseminated) listeriosis?
The ICD-10-CM code for neonatal (disseminated) listeriosis is P37.2 (sometimes written as P372). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is P37.2 (Other congenital infectious and parasitic diseases) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report neonatal (disseminated) listeriosis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does P37.2 group to?
When neonatal (disseminated) listeriosis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 791, 793, with relative weights from 4.0590 to 4.1696 depending on complications. Higher weights mean higher Medicare reimbursement.
Is P37.2 a CC or MCC?
CMS lists P37.2 as an MCC (major complication or comorbidity) for FY 2026. 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 188 closely related codes in its exclusion list.
What is the ICD-9 equivalent of P37.2?
Under the General Equivalence Mappings, neonatal (disseminated) listeriosis converts to ICD-9-CM 771.2 (congenital infec NEC). The mapping is approximate, so confirm the match fits the documentation.
