2027 ICD-10-CM Diagnosis Code P37.3Congenital falciparum malaria

ICD-10-CM Codes›P00–P96›P35-P39›P37

ICD-10-CM P37.3
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

P37.3 is a billable ICD-10-CM diagnosis code for congenital falciparum malaria. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Parasitic, other specified and unspecified infections; and Perinatal infections.

Code Identity

ICD-10-CM Code
P37.3
Billable Status
Yes — Valid for Submission
Code Describes
Congenital falciparum malaria
Short Description
Congenital falciparum malaria
Same as the full description in the CMS dataset.
Parent Code
P37
Other congenital infectious and parasitic diseases

Code Classification

ChapterP00–P96Certain conditions originating in the perinatal period
SectionP35-P39Infections specific to the perinatal period
CategoryP37Other congenital infectious and parasitic diseases
This CodeP37.3Congenital falciparum malaria

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Congenital falciparum malaria
  • Congenital malaria
  • Falciparum malaria

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to P37.3: 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.

From Chapter 16 (P00-P96) Certain conditions originating in the perinatal period applies to 463 codes
  • 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.

From P37 Other congenital infectious and parasitic diseases applies to 8 codes
  • congenital syphilis (A50.-)
  • infectious neonatal diarrhea (A00-A09)
  • necrotizing enterocolitis in newborn (P77.-)
  • noninfectious neonatal diarrhea (P78.3)
  • ophthalmia neonatorum due to gonococcus (A54.31)
  • tetanus neonatorum (A33)
From Block P35-P39 Infections specific to the perinatal period applies to 34 codes
  • 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)
From Chapter 16 (P00-P96) Certain conditions originating in the perinatal period applies to 463 codes
  • 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)

Notes

General instructions on how these codes are used.

From Chapter 16 (P00-P96) Certain conditions originating in the perinatal period applies to 463 codes
  • 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 P37.3, its category, or a range that includes it.

Excludes2 2

These codes carry an Excludes2 note naming P37.3: 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
    infectious and parasitic diseases specific to the perinatal period (P35-P39) names P35-P39, which includes this code
  • P00.2 Newborn affected by maternal infectious and parasitic diseases
    infections specific to the perinatal period (P35-P39) names P35-P39, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

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

CCSR INF009
Parasitic, other specified and unspecified infections
Default principal diagnosis: inpatient No · outpatient No
CCSR PNL009
Perinatal infections
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Malaria

Malaria is a serious disease caused by a parasite. You get it when an infected mosquito bites you. Malaria is a major cause of death worldwide, but it is almost wiped out in the United States. The disease is mostly a problem in developing countries with warm climates. If you travel to these countries, you are at risk.

Read the full article at MedlinePlus

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

Convert P37.3 to ICD-9-CMHistory

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

ICD-9-CM
771.2 Congenital infec NEC
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About P37.3Overview

What is the ICD-10 code for congenital falciparum malaria?

The ICD-10-CM code for congenital falciparum malaria is P37.3 (sometimes written as P373). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is P37.3 (Other congenital infectious and parasitic diseases) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report congenital falciparum malaria on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does P37.3 group to?

When congenital falciparum malaria 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 P37.3 a CC or MCC?

CMS lists P37.3 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 P37.3?

Under the General Equivalence Mappings, congenital falciparum malaria converts to ICD-9-CM 771.2 (congenital infec NEC). The mapping is approximate, so confirm the match fits the documentation.