2027 ICD-10-CM Diagnosis Code B52.9Plasmodium malariae malaria without complication
ICD-10-CM Codes›A00–B99›B50-B64›B52
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
B52.9 is a billable ICD-10-CM diagnosis code for plasmodium malariae malaria without complication. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 867 through 869. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 32 closely related codes. Coders also document this condition as intermittent fever. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Parasitic, other specified and unspecified infections.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Intermittent fever
- Malarial fever
- Malarial red blood cell inclusion
- Plasmodium malariae gametocyte in red cell
- Quartan fever
- Quartan malaria
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to B52.9: its own notes plus those printed at B52, block B50-B64, and Chapter 1. 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.
- mixed infections of Plasmodium malariae with other Plasmodium species, except Plasmodium falciparum and Plasmodium vivax
- diseases generally recognized as communicable or transmissible
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.
- Plasmodium malariae malaria NOS
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
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.
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code to identify resistance to antimicrobial drugs (Z16.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name B52.9, its category, or a range that includes it.
Applicable To 1
These notes mention B52.9.
- O98.6 Protozoal diseases complicating pregnancy, childbirth and the puerperium
Excludes1 2
These codes carry an Excludes1 note naming B52.9: they are not reported together with it, unless the two conditions are unrelated.
Code First 2
These codes say to code first a condition named in the note, and B52.9 is one of the conditions named.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) R50.9
quartan (malaria) B52.9
malariae B52.9
malariae NEC B52.9
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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 B52.9 to ICD-9-CMHistory
Code HistoryHistory
Questions About B52.9Overview
What is the ICD-10 code for plasmodium malariae malaria without complication?
The ICD-10-CM code for plasmodium malariae malaria without complication is B52.9 (sometimes written as B529). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is B52.9 (Plasmodium malariae malaria) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report plasmodium malariae malaria without complication on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does B52.9 group to?
When plasmodium malariae malaria without complication is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 869, 868, with relative weights from 0.6784 to 2.1855 depending on complications. Higher weights mean higher Medicare reimbursement.
Is B52.9 a CC or MCC?
CMS lists B52.9 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 32 closely related codes in its exclusion list.
Can B52.9 be reported with a code from B50?
Not as a rule. The Excludes1 note at B52, which applies to B52.9, lists "Plasmodium falciparum (B50.-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
