Mary Zwirb, M.D.
NPI 1861521957 · Geriatric Medicine (Internal Medicine) Physician · Falls Church, VA
Mary Zwirb, M.D. is a Geriatric Medicine (Internal Medicine) Physician provider in Falls Church, VA (NPI 1861521957).
Provider details
- NPI number
- 1861521957
- Entity type
- Individual
- Primary specialty
- Geriatric Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 0101040995 (VA)
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
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
- 2007-03-05
- Last updated
- 2007-07-08
Frequently asked questions
- What is Mary Zwirb's NPI number?
- Mary Zwirb's National Provider Identifier (NPI) is 1861521957, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Zwirb's specialty?
- Mary Zwirb is listed in the NPPES registry with a primary specialty of Geriatric Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Mary Zwirb located?
- Mary Zwirb's practice location on file with NPPES is 201 N Washington St, Falls Church, VA 22046-4518.
- What is Mary Zwirb's phone number?
- The practice phone number listed in the NPPES registry for Mary Zwirb is (703) 237-4000.
- Is Mary Zwirb's NPI active?
- Yes — Mary Zwirb's NPI (1861521957) 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.