2027 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 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 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
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to P37.2: its own notes plus those printed at P37, block P35-P39, 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.
- 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
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.
- asymptomatic human immunodeficiency virus [HIV] infection status (Z21)
- congenital gonococcal infection (A54.-)
- congenital pneumonia (P23.-)
- congenital syphilis (A50.-)
- human immunodeficiency virus [HIV] disease (B20)
- infant botulism (A48.51)
- infectious diseases not specific to the perinatal period (A00-B99, J09, J10.-)
- intestinal infectious disease (A00-A09)
- laboratory evidence of human immunodeficiency virus [HIV] (R75)
- tetanus neonatorum (A33)
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 P37.2, its category, or a range that includes it.
Excludes1 1
These codes carry an Excludes1 note naming P37.2: they are not reported together with it, unless the two conditions are unrelated.
- A32 Listeriosisneonatal (disseminated) listeriosis (P37.2)
Excludes2 2
These codes carry an Excludes2 note naming P37.2: its condition is not part of those codes, and both may be reported when the patient has both.
- Chapter 1 (A00-B99) Certain infectious and parasitic diseases
- P00.2 Newborn affected by maternal infectious and parasitic diseases
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
Neonatal Listeriosis
a bacterial infection by listeria monocytogenes in a newborn infant up to 28 days old.
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
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
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, 2026 through September 30, 2027.
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, 2026 through September 30, 2027.
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 793, 791, with relative weights from 4.1073 to 4.2192 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 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 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.
