Mark Tan, M.D., P.C.
NPI 1386828861 · Specialist · Smithtown, NY
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Tan, M.D., P.C. is a Specialist organization in Smithtown, NY (NPI 1386828861).
Provider details
- NPI number
- 1386828861
- Entity type
- Organization
- Primary specialty
- SpecialistOther Service Providers
- Organization subpart
- No
- Authorized official
- Mark Tan, Owner(631) 724-8900
- License
- 165674 (NY)
Specialties & taxonomies
Other Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
18 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
- 2007-12-20
- Last updated
- 2008-01-07
Frequently asked questions
- What is Mark Tan, M.D., P.C.'s NPI number?
- Mark Tan, M.D., P.C.'s National Provider Identifier (NPI) is 1386828861, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Mark Tan, M.D., P.C.?
- Mark Tan, M.D., P.C. is classified in the NPPES registry as Specialist (Other Service Providers).
- Where is Mark Tan, M.D., P.C. located?
- Mark Tan, M.D., P.C.'s practice location on file with NPPES is 222 Middle Country Rd, Smithtown, NY 11787.
- What is Mark Tan, M.D., P.C.'s phone number?
- The practice phone number listed in the NPPES registry for Mark Tan, M.D., P.C. is (631) 821-5893.
- Does Mark Tan, M.D., P.C. accept Medicare?
- Mark Tan, M.D., P.C. is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for Mark Tan, M.D., P.C.?
- The authorized official listed on Mark Tan, M.D., P.C.'s NPPES record is Mark Tan, Owner. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Mark Tan, M.D., P.C.'s NPI active?
- Yes — Mark Tan, M.D., P.C.'s NPI (1386828861) is active in the NPPES registry as of the last update on 2008-01-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.