Zachary Lamaster, D.O.
NPI 1265667810 · Family Medicine Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Zachary Lamaster, D.O. is a Family Medicine Physician provider in Chicago, IL (NPI 1265667810).
Provider details
- NPI number
- 1265667810
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 036130431 (IL)
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
17 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
281 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 | 66 | $9 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 55 | $132 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 34 | $81 |
| Admn Sarscov2 Vacc 1 Dose90480 | 30 | $45 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 29 | $92 |
| Administration of Influenza Virus VaccineG0008 | 23 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 22 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 92 | 29 |
| Lisinopril | 56 | 16 |
| Metformin Hcl | 27 | — |
| Lorazepam | 25 | — |
| Emtricitabine/Tenofov Alafenambrand: Descovy | 23 | — |
| Gabapentin | 23 | — |
| Losartan Potassium |
Practice location
Mailing address
Additional practice locations (1)
- 5425 W Lake StChicago, IL 60644-2342Phone: (773) 378-3347Fax: (773) 378-4028
Registry dates
- Enumerated
- 2009-05-27
- Last updated
- 2025-03-20
- Certified
- 2025-03-20
Frequently asked questions
- What is Zachary Lamaster's NPI number?
- Zachary Lamaster's National Provider Identifier (NPI) is 1265667810, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Zachary Lamaster's specialty?
- Zachary Lamaster is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Zachary Lamaster located?
- Zachary Lamaster's practice location on file with NPPES is 4600 N Ravenswood Ave Fl 2, Chicago, IL 60640.
- What is Zachary Lamaster's phone number?
- The practice phone number listed in the NPPES registry for Zachary Lamaster is (773) 561-7500.
- Does Zachary Lamaster accept Medicare?
- Zachary Lamaster is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Zachary Lamaster's NPI active?
- Yes — Zachary Lamaster's NPI (1265667810) is active in the NPPES registry as of the last update on 2025-03-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.