DR. ALEXANDER TIEMEIER D.O.
NPI 1932632213
Internal Medicine - Cardiovascular Disease in Buffalo, NY
About Dr. Alexander Tiemeier D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ALEXANDER TIEMEIER D.O. (NPI 1932632213) is an individual cardiovascular disease provider in Buffalo, New York, licensed in New York (334553) and active in the NPI registry since April 2017. He is enrolled in Medicare PECOS, is affiliated with Sisters Of Charity Hospital, and is a graduate of Lake Erie College Of Osteopathic Medicine, Bradenton (2017).
NPPES Registry Identity
Specialties & Licenses 3
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Alexander Tiemeier D.o. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
5Medicare enrollment records show Alexander Tiemeier reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Buffalo, NY 14214
- Reassigned Medicare billing, New York enrollment
- 515 clinicians in this Medicare group
Buffalo, NY 14214
- Reassigned Medicare billing, New York enrollment
- 332 clinicians in this Medicare group
Kenmore, NY 14217
- Reassigned Medicare billing, New York enrollment
- 271 clinicians in this Medicare group
Buffalo, NY 14220
- Reassigned Medicare billing, New York enrollment
- Medicare enrollment name: Mercy Hospital Of Buffalo
- 499 clinicians in this Medicare group
Lewiston, NY 14092
- Reassigned Medicare billing, New York enrollment
- Medicare enrollment name: Mount St. Marys Hospital Of Niagara Falls
- 289 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Sisters Of Charity Hospital
Acute Care Hospitals · Buffalo, NYMercy Hospital Of Buffalo
Acute Care Hospitals · Buffalo, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 14215 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BUFFALO, NY 14215
BUFFALO, NY 14215
BUFFALO, NY 14215
BUFFALO, NY 14215
BUFFALO, NY 14215
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Alexander Tiemeier's NPI number?
The NPI number for Alexander Tiemeier is 1932632213. It was assigned to this individual provider in the NPPES registry on April 4, 2017.
Where is Alexander Tiemeier located?
Alexander Tiemeier practices at 462 Grider St, Buffalo, NY 14215. The listed phone number is (716) 898-4226.
What is Alexander Tiemeier's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.
Is Alexander Tiemeier enrolled in Medicare?
Yes. Alexander Tiemeier is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Alexander Tiemeier's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Alexander Tiemeier reassigns Medicare benefits to 5 organizations: Sisters Of Charity Hospital Of Buffalo New York (Buffalo, NY), Trinity Medical Wny PC (Buffalo, NY), Kenmore Mercy Hospital (Kenmore, NY), Chs Neuroscience Group (Buffalo, NY) and Mount St. Mary's Hospital Of Niagara Falls (Lewiston, NY). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Alexander Tiemeier's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Alexander Tiemeier affiliated with any hospitals?
According to CMS data, Alexander Tiemeier is affiliated with Sisters Of Charity Hospital and Mercy Hospital Of Buffalo.
When was this NPI record last updated?
The NPPES record for Alexander Tiemeier was last updated on August 20, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Alexander Tiemeier, D.O. · NPI 1932632213
Cardiovascular Disease physician in Buffalo, New York. Individual provider, active in the CMS NPPES registry since April 4, 2017.
## Identity
- **NPI:** 1932632213 (Entity type: Individual)
- **Enumerated:** April 4, 2017
- **Primary specialty:** Internal Medicine - Cardiovascular Disease · taxonomy 207RC0000X
- **State license:** 334553 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 462 GRIDER ST, Buffalo, NY 14215-3021
- **Phone:** (716) 898-4226
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 5 organizations under Medicare reassignment (form CMS-855R): Sisters Of Charity Hospital Of Buffalo New York (NPI 1790727543, Buffalo, NY); Trinity Medical Wny PC (NPI 1205468055, Buffalo, NY); Kenmore Mercy Hospital (NPI 1770598104, Kenmore, NY); Chs Neuroscience Group (NPI 1972883304, Buffalo, NY); Mount St. Mary's Hospital Of Niagara Falls (NPI 1043394745, Lewiston, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Lake Erie College Of Osteopathic Medicine, Bradenton, class of 2017
## Record status
- **NPPES last updated:** August 20, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1932632213) · Data from the CMS NPPES public registry.