ICD-10 · PDGM grouping
B50-B64 — Protozoal diseases
Every ICD-10-CM code in this range and the PDGM clinical group CMS assigns to it, read from the CMS grouper crosswalk v07.2.26.
Codes in range
57
No clinical group
1
A period cannot be grouped from these.
Barred as primary
0
CMS rejects these in the primary position.
Where these codes group
52 of the 57 codes in B50-B64 group to MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases, but the range is not uniform — it spreads across 2 clinical groups. A further 1 are assigned no clinical group at all, which means a 30-day period cannot be grouped from them.
Code families in B50-B64
One page per three-character family: every code in it, whether it can lead a claim, its clinical group and comorbidity subgroup.
- B50Plasmodium falciparum malaria3 codes
- B51Plasmodium vivax malaria3 codes
- B52Plasmodium malariae malaria3 codes
- B53Other specified malaria3 codes
- B54Unspecified malaria1 code
- B55Leishmaniasis4 codes
- B56African trypanosomiasis3 codes
- B57Chagas' disease12 codes
- B58Toxoplasmosis11 codes
- B59Pneumocystosis1 code
- B60Other protozoal diseases, not elsewhere classified12 codes
- B64Unspecified protozoal disease1 code
Every code in B50-B64
Descriptions are CMS’s own, abbreviated as CMS abbreviates them.
| Code | Description | Clinical group | Primary position |
|---|---|---|---|
| B500 | Plasmodium falciparum malaria with cerebral complications | K | Can lead a claim |
| B508 | Other severe and complicated Plasmodium falciparum malaria | K | Can lead a claim |
| B509 | Plasmodium falciparum malaria, unspecified | K | Can lead a claim |
| B510 | Plasmodium vivax malaria with rupture of spleen | K | Can lead a claim |
| B518 | Plasmodium vivax malaria with other complications | K | Can lead a claim |
| B519 | Plasmodium vivax malaria without complication | K | Can lead a claim |
| B520 | Plasmodium malariae malaria with nephropathy | K | Can lead a claim |
| B528 | Plasmodium malariae malaria with other complications | K | Can lead a claim |
| B529 | Plasmodium malariae malaria without complication | K | Can lead a claim |
| B530 | Plasmodium ovale malaria | K | Can lead a claim |
| B531 | Malaria due to simian plasmodia | K | Can lead a claim |
| B538 | Other malaria, not elsewhere classified | K | Can lead a claim |
| B54 | Unspecified malaria | K | Can lead a claim |
| B550 | Visceral leishmaniasis | K | Can lead a claim |
| B551 | Cutaneous leishmaniasis | K | Can lead a claim |
| B552 | Mucocutaneous leishmaniasis | K | Can lead a claim |
| B559 | Leishmaniasis, unspecified | K | Can lead a claim |
| B560 | Gambiense trypanosomiasis | K | Can lead a claim |
| B561 | Rhodesiense trypanosomiasis | K | Can lead a claim |
| B569 | African trypanosomiasis, unspecified | K | Can lead a claim |
| B570 | Acute Chagas' disease with heart involvement | K | Can lead a claim |
| B571 | Acute Chagas' disease without heart involvement | K | Can lead a claim |
| B572 | Chagas' disease (chronic) with heart involvement | K | Can lead a claim |
| B5730 | Chagas' disease with digestive system involvement, unsp | K | Can lead a claim |
| B5731 | Megaesophagus in Chagas' disease | K | Can lead a claim |
| B5732 | Megacolon in Chagas' disease | K | Can lead a claim |
| B5739 | Other digestive system involvement in Chagas' disease | K | Can lead a claim |
| B5740 | Chagas' disease with nervous system involvement, unspecified | K | Can lead a claim |
| B5741 | Meningitis in Chagas' disease | B | Can lead a claim |
| B5742 | Meningoencephalitis in Chagas' disease | B | Can lead a claim |
| B5749 | Other nervous system involvement in Chagas' disease | K | Can lead a claim |
| B575 | Chagas' disease (chronic) with other organ involvement | K | Can lead a claim |
| B5800 | Toxoplasma oculopathy, unspecified | K | Can lead a claim |
| B5801 | Toxoplasma chorioretinitis | K | Can lead a claim |
| B5809 | Other toxoplasma oculopathy | K | Can lead a claim |
| B581 | Toxoplasma hepatitis | K | Can lead a claim |
| B582 | Toxoplasma meningoencephalitis | B | Can lead a claim |
| B583 | Pulmonary toxoplasmosis | K | Can lead a claim |
| B5881 | Toxoplasma myocarditis | K | Can lead a claim |
| B5882 | Toxoplasma myositis | K | Can lead a claim |
| B5883 | Toxoplasma tubulo-interstitial nephropathy | K | Can lead a claim |
| B5889 | Toxoplasmosis with other organ involvement | K | Can lead a claim |
| B589 | Toxoplasmosis, unspecified | K | Can lead a claim |
| B59 | Pneumocystosis | K | Can lead a claim |
| B6000 | Babesiosis, unspecified | K | Can lead a claim |
| B6001 | Babesiosis due to Babesia microti | K | Can lead a claim |
| B6002 | Babesiosis due to Babesia duncani | K | Can lead a claim |
| B6003 | Babesiosis due to Babesia divergens | K | Can lead a claim |
| B6009 | Other babesiosis | K | Can lead a claim |
| B6010 | Acanthamebiasis, unspecified | K | Can lead a claim |
| B6011 | Meningoencephalitis due to Acanthamoeba (culbertsoni) | B | Can lead a claim |
| B6012 | Conjunctivitis due to Acanthamoeba | K | Can lead a claim |
| B6013 | Keratoconjunctivitis due to Acanthamoeba | K | Can lead a claim |
| B6019 | Other acanthamebic disease | K | Can lead a claim |
| B602 | Naegleriasis | K | Can lead a claim |
| B608 | Other specified protozoal diseases | K | Can lead a claim |
| B64 | Unspecified protozoal disease | None | Cannot lead a claim |
Source: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
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