Zachary Liao, MD, MPH, MS
NPI 1538692207 · Internal Medicine Physician · Boston, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Zachary Liao, MD, MPH, MS is a Internal Medicine Physician provider in Boston, MA (NPI 1538692207).
Provider details
- NPI number
- 1538692207
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, MPH, MS
- Sex
- Male
- Sole proprietor
- No
- License
- 294797 (MA)
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
9 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
435 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) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 105 | $9 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 50 | $84 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 42 | $94 |
| Hemoglobin A1c Level83036 | 40 | $10 |
| Blood Test, Lipids (cholesterol and Triglycerides)80061 | 37 | $13 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 28 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 25 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 57 | 23 |
| Atorvastatin Calcium | 56 | 22 |
| Lisinopril | 34 | 14 |
| Hydrochlorothiazide | 28 | — |
| Metoprolol Succinate | 25 | — |
| Atenolol | 24 | — |
| Metformin Hclbrand: Metformin Hcl Er | 24 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2017-04-09
- Last updated
- 2022-09-08
- Certified
- 2022-09-08
Frequently asked questions
- What is Zachary Liao's NPI number?
- Zachary Liao's National Provider Identifier (NPI) is 1538692207, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Zachary Liao's specialty?
- Zachary Liao is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Zachary Liao located?
- Zachary Liao's practice location on file with NPPES is 133 Brookline Ave, Boston, MA 02215-3904.
- What is Zachary Liao's phone number?
- The practice phone number listed in the NPPES registry for Zachary Liao is (617) 421-1000.
- Does Zachary Liao accept Medicare?
- Zachary Liao is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Zachary Liao's NPI active?
- Yes — Zachary Liao's NPI (1538692207) is active in the NPPES registry as of the last update on 2022-09-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.