Thomas Marciniak, M.D.
NPI 1558368076 · Internal Medicine Physician · North Bethesda, MD
Thomas Marciniak, M.D. is a Internal Medicine Physician provider in North Bethesda, MD (NPI 1558368076).
Provider details
- NPI number
- 1558368076
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- License
- D0057868 (MD)
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
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
- 2005-06-30
- Last updated
- 2007-07-08
Frequently asked questions
- What is Thomas Marciniak's NPI number?
- Thomas Marciniak's National Provider Identifier (NPI) is 1558368076, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Thomas Marciniak's specialty?
- Thomas Marciniak is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Thomas Marciniak located?
- Thomas Marciniak's practice location on file with NPPES is 6400 Windermere Cir, North Bethesda, MD 20852-3539.
- What is Thomas Marciniak's phone number?
- The practice phone number listed in the NPPES registry for Thomas Marciniak is (301) 530-1855.
- Is Thomas Marciniak's NPI active?
- Yes — Thomas Marciniak's NPI (1558368076) 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.