Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

William K Gretzinger, DO

Individual provider Anesthesiology Physician · NPI 1518994979

William K Gretzinger, DO is an Anesthesiology Physician in Petoskey, Michigan. Licensed in Michigan. Registered with an NPI since 2006.

Licensed in
MI
In the registry since
2006
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

416 Connable Ave ER Dept
Petoskey, MI 49770
Phone: (231) 487-4000
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Specialties & licences

Emergency Medical Services (Emergency Medicine) Physician (primary) Taxonomy 207PE0004X · Licence WG011330 (MI)
Anesthesiology Physician Taxonomy 207L00000X · Licence 5101011330 (MI)

Record details

NPI number1518994979
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJune 28, 2006
Last updated in NPPESOctober 9, 2019
Mailing address930 Spring Street, Petoskey, MI 49770

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