Mark Tieman, M.D.
NPI 1154494003 · Internal Medicine Physician · Commack, NY
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Tieman, M.D. is a Internal Medicine Physician provider in Commack, NY (NPI 1154494003).
Provider details
- NPI number
- 1154494003
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 179172 (NY)
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
19 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
915 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) |
|---|---|---|
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 361 | $18 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 175 | $104 |
| Telephone Medical Discussion With Physician, 21-30 Minutes99443 | 131 | $146 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 122 | $145 |
| Telephone Medical Discussion With Physician, 11-20 Minutes99442 | 114 | $103 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent Visit |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Alprazolam | 50 |
| Oxycodone Hcl | 24 |
| Omeprazole | 21 |
| Azelastine Hcl | 15 |
| Buprenorphine Hcl/Naloxone Hclbrand: Buprenorphine-Naloxone | 15 |
| Oxycodone Hcl/Acetaminophenbrand: Oxycodone-Acetaminophen | 14 |
| Buprenorphine Hcl/Naloxone Hclbrand: Suboxone | 14 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-16
- Last updated
- 2007-07-08
Frequently asked questions
- What is Mark Tieman's NPI number?
- Mark Tieman's National Provider Identifier (NPI) is 1154494003, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Tieman's specialty?
- Mark Tieman is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Tieman located?
- Mark Tieman's practice location on file with NPPES is 356 Veterans Memorial Hwy, Commack, NY 11725-4332.
- What is Mark Tieman's phone number?
- The practice phone number listed in the NPPES registry for Mark Tieman is (631) 858-0400.
- Does Mark Tieman accept Medicare?
- Mark Tieman is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Tieman's NPI active?
- Yes — Mark Tieman's NPI (1154494003) 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.