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 v07.1.26.

OASIS-E2 v1.00.0 · ingested 2026-04-26

Codes in range

No clinical group

A period cannot be grouped from these.

Barred as primary

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.

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	Accepted
B508	Other severe and complicated Plasmodium falciparum malaria	K	Accepted
B509	Plasmodium falciparum malaria, unspecified	K	Accepted
B510	Plasmodium vivax malaria with rupture of spleen	K	Accepted
B518	Plasmodium vivax malaria with other complications	K	Accepted
B519	Plasmodium vivax malaria without complication	K	Accepted
B520	Plasmodium malariae malaria with nephropathy	K	Accepted
B528	Plasmodium malariae malaria with other complications	K	Accepted
B529	Plasmodium malariae malaria without complication	K	Accepted
B530	Plasmodium ovale malaria	K	Accepted
B531	Malaria due to simian plasmodia	K	Accepted
B538	Other malaria, not elsewhere classified	K	Accepted
B54	Unspecified malaria	K	Accepted
B550	Visceral leishmaniasis	K	Accepted
B551	Cutaneous leishmaniasis	K	Accepted
B552	Mucocutaneous leishmaniasis	K	Accepted
B559	Leishmaniasis, unspecified	K	Accepted
B560	Gambiense trypanosomiasis	K	Accepted
B561	Rhodesiense trypanosomiasis	K	Accepted
B569	African trypanosomiasis, unspecified	K	Accepted
B570	Acute Chagas' disease with heart involvement	K	Accepted
B571	Acute Chagas' disease without heart involvement	K	Accepted
B572	Chagas' disease (chronic) with heart involvement	K	Accepted
B5730	Chagas' disease with digestive system involvement, unsp	K	Accepted
B5731	Megaesophagus in Chagas' disease	K	Accepted
B5732	Megacolon in Chagas' disease	K	Accepted
B5739	Other digestive system involvement in Chagas' disease	K	Accepted
B5740	Chagas' disease with nervous system involvement, unspecified	K	Accepted
B5741	Meningitis in Chagas' disease	B	Accepted
B5742	Meningoencephalitis in Chagas' disease	B	Accepted
B5749	Other nervous system involvement in Chagas' disease	K	Accepted
B575	Chagas' disease (chronic) with other organ involvement	K	Accepted
B5800	Toxoplasma oculopathy, unspecified	K	Accepted
B5801	Toxoplasma chorioretinitis	K	Accepted
B5809	Other toxoplasma oculopathy	K	Accepted
B581	Toxoplasma hepatitis	K	Accepted
B582	Toxoplasma meningoencephalitis	B	Accepted
B583	Pulmonary toxoplasmosis	K	Accepted
B5881	Toxoplasma myocarditis	K	Accepted
B5882	Toxoplasma myositis	K	Accepted
B5883	Toxoplasma tubulo-interstitial nephropathy	K	Accepted
B5889	Toxoplasmosis with other organ involvement	K	Accepted
B589	Toxoplasmosis, unspecified	K	Accepted
B59	Pneumocystosis	K	Accepted
B6000	Babesiosis, unspecified	K	Accepted
B6001	Babesiosis due to Babesia microti	K	Accepted
B6002	Babesiosis due to Babesia duncani	K	Accepted
B6003	Babesiosis due to Babesia divergens	K	Accepted
B6009	Other babesiosis	K	Accepted
B6010	Acanthamebiasis, unspecified	K	Accepted
B6011	Meningoencephalitis due to Acanthamoeba (culbertsoni)	B	Accepted
B6012	Conjunctivitis due to Acanthamoeba	K	Accepted
B6013	Keratoconjunctivitis due to Acanthamoeba	K	Accepted
B6019	Other acanthamebic disease	K	Accepted
B602	Naegleriasis	K	Accepted
B608	Other specified protozoal diseases	K	Accepted
B64	Unspecified protozoal disease	None	Cannot group

Source: CMS HH PPS Grouper Software v07.1.26, effective 2026-04-01. 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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B50-B64 — Protozoal diseases

Where these codes group

Every code in B50-B64

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