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Frederick Lillis, MD
NPI 1669408126 · Internal Medicine Physician · Leesburg, VA
Frederick Lillis, MD is a Internal Medicine Physician provider in Leesburg, VA (NPI 1669408126).
Provider details
- NPI number
- 1669408126
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 0101022634 (VA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(91/100 index)
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
224d Cornwall St Nw
Suite 302
Leesburg, VA 20176-2700
Phone: (703) 737-7622
Fax: (703) 737-7943
Street-level locationGet directions
Mailing address
224d Cornwall St Nw
Leesburg, VA 20176-2700
Registry dates
- Enumerated
- 2006-06-24
- Last updated
- 2012-11-01
Frequently asked questions
- What is Frederick Lillis's NPI number?
- Frederick Lillis's National Provider Identifier (NPI) is 1669408126, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Frederick Lillis's specialty?
- Frederick Lillis is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Frederick Lillis located?
- Frederick Lillis's practice location on file with NPPES is 224d Cornwall St Nw, Leesburg, VA 20176-2700.
- What is Frederick Lillis's phone number?
- The practice phone number listed in the NPPES registry for Frederick Lillis is (703) 737-7622.
- Is Frederick Lillis's NPI active?
- Yes — Frederick Lillis's NPI (1669408126) is active in the NPPES registry as of the last update on 2012-11-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.