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

Dr. Ruth Callaway Warren, DO

Individual provider Medical Oncology Physician · NPI 1124096185

Dr. Ruth Callaway Warren, DO is a Medical Oncology Physician in Green Bay, Wisconsin. Licensed in Michigan and Wisconsin. Registered with an NPI since 2006.

Licensed in
MI, WI
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

1726 Shawano Ave
Green Bay, WI 54303-3216
Phone: (920) 884-3135
Fax: (920) 884-3144
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Medical Oncology Physician (primary) Taxonomy 207RX0202X · Licence 50362 (WI)
Medical Oncology Physician Taxonomy 207RX0202X · Licence 5101018539 (MI)

Record details

NPI number1124096185
Entity typeIndividual (Type 1)
GenderFemale
Credentials DO
Sole proprietorNo
NPI enumeratedMarch 8, 2006
Last updated in NPPESDecember 20, 2021
Certification dateDecember 20, 2021
Mailing address1726 Shawano Ave, Green Bay, WI 54303-3216

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