William Zimmer, M.D.
NPI 1275575821 · Hematology & Oncology Physician · Springfield, IL
William Zimmer, M.D. is a Hematology & Oncology Physician provider in Springfield, IL (NPI 1275575821).
Provider details
- NPI number
- 1275575821
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
83% 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
- 2006-06-11
- Last updated
- 2007-10-02
Frequently asked questions
- What is William Zimmer's NPI number?
- William Zimmer's National Provider Identifier (NPI) is 1275575821, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Zimmer's specialty?
- William Zimmer is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is William Zimmer located?
- William Zimmer's practice location on file with NPPES is 301 N 8th St, Springfield, IL 62701-1041.
- What is William Zimmer's phone number?
- The practice phone number listed in the NPPES registry for William Zimmer is (217) 535-3799.
- Is William Zimmer's NPI active?
- Yes — William Zimmer's NPI (1275575821) is active in the NPPES registry as of the last update on 2007-10-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.