WILLIAM SLAGER
NPI 1902360605
Physician Assistant in Grand Rapids, MI

Q: What is William Slager's NPI number?

The NPI number for William Slager is 1902360605. It was assigned to this individual provider in the NPPES registry on January 27, 2019.

Q: What is William Slager's specialty?

The primary specialty registered for this NPI is Physician Assistant with taxonomy code 363A00000X.

Q: When was this NPI record last updated?

The NPPES record for William Slager was last updated on May 7, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.

Active since January 27, 2019PECOS EnrolledAccepts Medicare Assignment

235 WEALTHY ST SE, GRAND RAPIDS, MI 49503(616) 840-8224(616) 840-9690 Get Directions Write a Review

NPPES record last updated: May 7, 2026. Verified against the NPPES registry weekly; last sync: August 23, 2026.

Record update history: May 7, 2026, Jan 27, 2019 (2 updates tracked since 2019).

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About William Slager NPPES

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

WILLIAM SLAGER (NPI 1902360605) is an individual physician assistant in Grand Rapids, Michigan, licensed in Michigan (5601008991) and active in the NPI registry since January 2019. He is enrolled in Medicare PECOS, is affiliated with Mercy Health Saint Mary's, and is a graduate of Other (2018).

NPPES Registry Identity

NPI1902360605

Entity TypeIndividualMale

Primary Taxonomy363A00000X

Provider Legal NameWILLIAM SLAGER

Location Address235 WEALTHY ST SEGrand Rapids, MI 49503-5247

Mailing Address235 Wealthy St SeGrand Rapids, MI 49503-5247 · (616) 840-8224 · Fax (616) 840-9690

Phone(616) 840-8224

Fax(616) 840-9690

Sole ProprietorNo

Medical School CMSOtherGraduated 2018

Enumeration DateJanuary 27, 2019

Last NPPES UpdateMay 7, 20262 updates tracked since enumeration

NPPES CertifiedMay 7, 2026

✔ NPI 1902360605 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPhysician AssistantPhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code363A00000X

License✔ Licensed in MI · 5601008991

Definition

A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.

235 WEALTHY ST SE, Grand Rapids, MI 49503

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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Care Network of Michigan, Blue Cross Blue Shield of Michigan Mutual Insurance Company, Oscar Insurance Company and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

William Slager 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 ID941548523

PECOS Enrollment IDI20190206000388

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.

Areas of Expertise CMS Part B claims 2

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.

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

25 services22 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.

18 services14 patients

Hospital Affiliations CMS Care Compare

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

Mercy Health Saint Mary's

Acute Care Hospitals · Grand Rapids, MI

4/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number230059

Location200 Jefferson Avenue SEGrand Rapids, MI 49503 · Kent County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 49503 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

$84.74 typical visit price

range $54.34 – $166.68

Typical copayment $21.18 (range $13.58 – $41.67)

Most-billed visit code 99203

Established Patient

$68.07 typical visit price

range $17.09 – $135.40

Typical copayment $17.01 (range $4.27 – $33.85)

Most-billed visit code 99213

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 20

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

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