William Seid, M.D.
NPI 1174563233 · Colon & Rectal Surgery Physician · Fairfax, VA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Seid, M.D. is a Colon & Rectal Surgery Physician provider in Fairfax, VA (NPI 1174563233).
Provider details
- NPI number
- 1174563233
- Entity type
- Individual
- Primary specialty
- Colon & Rectal Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 0101047062 (VA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
12 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 12 | $58 |
Typical Medicare-allowed amounts for these services range $58–$58 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-07
- Last updated
- 2017-12-05
Frequently asked questions
- What is William Seid's NPI number?
- William Seid's National Provider Identifier (NPI) is 1174563233, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Seid's specialty?
- William Seid is listed in the NPPES registry with a primary specialty of Colon & Rectal Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is William Seid located?
- William Seid's practice location on file with NPPES is 12255 Fair Lakes Pkwy, Fairfax, VA 22033-3952.
- What is William Seid's phone number?
- The practice phone number listed in the NPPES registry for William Seid is (703) 934-5770.
- Does William Seid accept Medicare?
- William Seid is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Seid's NPI active?
- Yes — William Seid's NPI (1174563233) is active in the NPPES registry as of the last update on 2017-12-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.