William Tsiaras, M.D., PH.D.
NPI 1215255526 · Dermatology Physician · Boston, MA
Enrolled with Medicare as Practitioner - Dermatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Tsiaras, M.D., PH.D. is a Dermatology Physician provider in Boston, MA (NPI 1215255526).
Provider details
- NPI number
- 1215255526
- Entity type
- Individual
- Primary specialty
- Dermatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D., PH.D.
- Sex
- Male
- Sole proprietor
- No
- License
- LP01895 (RI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
16 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
1,515 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) |
|---|---|---|
| Destruction of Precancer Skin Growth, 2-14 Growths17003 | 391 | $2 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 375 | $152 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 352 | $101 |
| Destruction of Precancer Skin Growth, 1 Growth17000 | 147 | $59 |
| Prolonged Office Or Other Outpatient Evaluation and Management Service(s) Beyond the Maximum Required Time of the Primary Procedure Which Has Been Selected Using Total Time on the Date of the Primary Service; Each Additional 15 Minutes By the Physician OrG2212 | 105 | $33 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 21 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Clobetasol Propionate | 76 | 29 |
| Triamcinolone Acetonide | 72 | 38 |
| Ketoconazole | 71 | 33 |
| Pentoxifylline | 35 | 11 |
| Lidocaine | 33 | 11 |
| Mupirocin | 33 | 14 |
| Betamethasone/Propylene Glycbrand: Betamethasone Diprop Augmented | 26 | 11 |
| Apremilastbrand: Otezla |
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-05-11
- Last updated
- 2015-03-19
Frequently asked questions
- What is William Tsiaras's NPI number?
- William Tsiaras's National Provider Identifier (NPI) is 1215255526, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Tsiaras's specialty?
- William Tsiaras is listed in the NPPES registry with a primary specialty of Dermatology Physician (Allopathic & Osteopathic Physicians).
- Where is William Tsiaras located?
- William Tsiaras's practice location on file with NPPES is 221 Longwood Ave, Boston, MA 02115-5804.
- What is William Tsiaras's phone number?
- The practice phone number listed in the NPPES registry for William Tsiaras is (617) 732-4918.
- Does William Tsiaras accept Medicare?
- William Tsiaras is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Tsiaras's NPI active?
- Yes — William Tsiaras's NPI (1215255526) is active in the NPPES registry as of the last update on 2015-03-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.