Gerald Bayer, M.D.
NPI 1285726729 · Medical Oncology Physician · Green Bay, WI
Gerald Bayer, M.D. is a Medical Oncology Physician provider in Green Bay, WI (NPI 1285726729).
Provider details
- NPI number
- 1285726729
- Entity type
- Individual
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 22282 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-09-29
- Last updated
- 2010-06-29
Frequently asked questions
- What is Gerald Bayer's NPI number?
- Gerald Bayer's National Provider Identifier (NPI) is 1285726729, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gerald Bayer's specialty?
- Gerald Bayer is listed in the NPPES registry with a primary specialty of Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Gerald Bayer located?
- Gerald Bayer's practice location on file with NPPES is 835 S Van Buren St, Green Bay, WI 54301-3526.
- What is Gerald Bayer's phone number?
- The practice phone number listed in the NPPES registry for Gerald Bayer is (920) 432-6049.
- Is Gerald Bayer's NPI active?
- Yes — Gerald Bayer's NPI (1285726729) is active in the NPPES registry as of the last update on 2010-06-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.