Herbert Sier, MD
NPI 1881627446 · Geriatric Medicine (Internal Medicine) Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Herbert Sier, MD is a Geriatric Medicine (Internal Medicine) Physician provider in Chicago, IL (NPI 1881627446).
Provider details
- NPI number
- 1881627446
- Entity type
- Individual
- Primary specialty
- Geriatric Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
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
19 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
- 2006-07-08
- Last updated
- 2007-07-08
Frequently asked questions
- What is Herbert Sier's NPI number?
- Herbert Sier's National Provider Identifier (NPI) is 1881627446, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Herbert Sier's specialty?
- Herbert Sier is listed in the NPPES registry with a primary specialty of Geriatric Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Herbert Sier located?
- Herbert Sier's practice location on file with NPPES is 680 N Lake Shore Dr, Chicago, IL 60611-4546.
- What is Herbert Sier's phone number?
- The practice phone number listed in the NPPES registry for Herbert Sier is (312) 695-9797.
- Does Herbert Sier accept Medicare?
- Herbert Sier is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Herbert Sier's NPI active?
- Yes — Herbert Sier's NPI (1881627446) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.