Mark Sahyouni, DO
NPI 1487458543 · Internal Medicine Physician · Columbia, SC
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Sahyouni, DO is a Internal Medicine Physician provider in Columbia, SC (NPI 1487458543).
Provider details
- NPI number
- 1487458543
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- Yes
- License
- LL93943 (SC)
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
1 yr 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
- 2025-04-01
- Last updated
- 2025-07-17
- Certified
- 2025-07-17
Frequently asked questions
- What is Mark Sahyouni's NPI number?
- Mark Sahyouni's National Provider Identifier (NPI) is 1487458543, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Sahyouni's specialty?
- Mark Sahyouni is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Sahyouni located?
- Mark Sahyouni's practice location on file with NPPES is 1801 Sunset Dr, Columbia, SC 29203-6803.
- What is Mark Sahyouni's phone number?
- The practice phone number listed in the NPPES registry for Mark Sahyouni is (803) 434-4153.
- Does Mark Sahyouni accept Medicare?
- Mark Sahyouni is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Sahyouni's NPI active?
- Yes — Mark Sahyouni's NPI (1487458543) is active in the NPPES registry as of the last update on 2025-07-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.