1. Home
  2. Directory
  3. Illinois
  4. Chicago
  5. Family Medicine
  6. NPI Profile

DR. ZACHARY PHILIP LAMASTER D.O.
NPI 1265667810
Family Medicine in Chicago, IL

Active since May 27, 2009PECOS EnrolledAccepts Medicare Assignment
4600 N RAVENSWOOD AVE FL 2, CHICAGO, IL 60640(773) 561-7500(773) 561-7612 Get Directions Write a Review

NPPES record last updated: March 20, 2025. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Mar 20, 2025, Dec 14, 2021, Oct 2, 2019 (3 updates tracked since 2019).

About Dr. Zachary Philip Lamaster D.o. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. ZACHARY PHILIP LAMASTER D.O. (NPI 1265667810) is an individual family medicine provider in Chicago, Illinois, licensed in Illinois (036130431) and active in the NPI registry since May 2009. He is enrolled in Medicare PECOS, is affiliated with Advocate Illinois Masonic Medical Center, and maintains a secondary practice location in Chicago.

NPPES Registry Identity

NPI1265667810
Entity TypeIndividualMale
Primary Taxonomy207Q00000X
Provider Legal NameDR. ZACHARY PHILIP LAMASTERCredential: D.O.
Location Address4600 N RAVENSWOOD AVE FL 2Chicago, IL 60640
Mailing Address29373 Network PlChicago, IL 60673-1293 · (847) 390-5900
Phone(773) 561-7500
Fax(773) 561-7612
Sole ProprietorNo
Medical School CMSMidwestern University, Chicago College Of Osteopathic MedGraduated 2009
Enumeration DateMay 27, 2009
Last NPPES UpdateMarch 20, 20253 updates tracked since enumeration
NPPES CertifiedMarch 20, 2025
✔ NPI 1265667810 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207Q00000X
License✔ Licensed in IL · 036130431
Definition
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.
4600 N RAVENSWOOD AVE FL 2, Chicago, IL 60640
Open in Google Maps ↗

Secondary Practice Location 1

Location 15425 W Lake StChicago, IL 60644-2342 · Phone (773) 378-3347 · Fax (773) 378-4028

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Health.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Zachary Philip Lamaster D.o. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID1557514809
PECOS Enrollment IDI20130116000572
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Zachary Lamaster reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Advocate Health And Hospitals Corp.
1.9 mi
Cardiovascular Disease
3118 N ASHLAND AVE
Chicago, IL 60657
  • Reassigned Medicare billing, Illinois enrollment
  • 4,870 clinicians in this Medicare group
NPI 1487951711 (773) 880-9722
Pcc Community Wellness Center
7.5 mi
Federally Qualified Health Center (FQHC)
14 LAKE ST
Oak Park, IL 60302
  • Reassigned Medicare billing, Illinois enrollment
  • 221 clinicians in this Medicare group
NPI 1871516799 (708) 383-0113

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 7

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Insertion of needle into vein for collection of blood sample 36415
This procedure involves inserting a small needle into a vein, typically in your arm, to collect a blood sample. It's a quick and simple process to help diagnose or monitor health conditions. You may feel a small prick, but discomfort is minimal.
66 services36 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
55 services36 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
34 services11 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
29 services27 patients
Administration of influenza virus vaccine G0008
The administration of the influenza virus vaccine, also known as the flu shot, is a simple procedure to protect against the flu. A healthcare provider injects a small dose of the vaccine into your arm. This stimulates your immune system to produce antibodies, which will help your body fight off the flu if exposed.
23 services23 patients
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439
An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.
23 services23 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Advocate Illinois Masonic Medical Center

Acute Care Hospitals · Chicago, IL
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140182
Location836 West Wellington AvenueChicago, IL 60657 · Cook County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60640 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$94.06 typical visit price
range $60.08 – $183.39
Typical copayment $23.51 (range $15.02 – $45.84)
Most-billed visit code 99203
Established Patient
$105.70 typical visit price
range $18.97 – $148.12
Typical copayment $26.42 (range $4.74 – $37.03)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 3

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. MARGARET ANNE WIEDMANN MD
Family Medicine
4600 N RAVENSWOOD AVE FL 2
CHICAGO, IL 60640
Cook County (773) 561-7500
PHILIP CHARLES GUTSELL MD
Family Medicine
4600 N RAVENSWOOD AVE FL 2
CHICAGO, IL 60640
Cook County (773) 561-7500
MY N MARK M.D.
Family Medicine
4600 N RAVENSWOOD AVE FL 2
CHICAGO, IL 60640
Cook County (773) 561-7500

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Zachary Lamaster's NPI number?

The NPI number for Zachary Lamaster is 1265667810. It was assigned to this individual provider in the NPPES registry on May 27, 2009.

Where is Zachary Lamaster located?

Zachary Lamaster practices at 4600 N Ravenswood Ave Fl 2, Chicago, IL 60640. The listed phone number is (773) 561-7500.

What is Zachary Lamaster's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Is Zachary Lamaster enrolled in Medicare?

Yes. Zachary Lamaster is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Zachary Lamaster's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Zachary Lamaster reassigns Medicare benefits to 2 organizations: Advocate Health And Hospitals Corp. (Chicago, IL) and Pcc Community Wellness Center (Oak Park, IL). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Zachary Lamaster's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Zachary Lamaster accept?

Health plans from Oscar Health list Zachary Lamaster as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Zachary Lamaster affiliated with any hospitals?

According to CMS data, Zachary Lamaster is affiliated with Advocate Illinois Masonic Medical Center.

When was this NPI record last updated?

The NPPES record for Zachary Lamaster was last updated on March 20, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.