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WARREN WILLIAM ACKER MD
NPI 1528697430
Student in an Organized Health Care Education/Training Program in Boston, MA

Active since April 02, 2020PECOS EnrolledAccepts Medicare Assignment
800 WASHINGTON ST # 238, BOSTON, MA 02111(617) 636-7010(617) 636-7100 Get Directions Write a Review

NPPES record last updated: July 5, 2023. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Jul 5, 2023, Jun 7, 2023, Apr 2, 2020 (3 updates tracked since 2020).

About Warren William Acker Md NPPES

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

WARREN WILLIAM ACKER MD (NPI 1528697430) is an individual student in an organized health care education/training program in Boston, Massachusetts, licensed in Massachusetts (3013512) and active in the NPI registry since April 2020. He is enrolled in Medicare PECOS, is affiliated with Lowell General Hospital, and is a graduate of Other (2020).

NPPES Registry Identity

NPI1528697430
Entity TypeIndividualMale
Primary Taxonomy390200000X
Provider Legal NameWARREN WILLIAM ACKERCredential: MD
Location Address800 WASHINGTON ST # 238Boston, MA 02111-1552
Mailing Address800 Washington St # 238Boston, MA 02111-1552 · (617) 636-7010 · Fax (617) 636-7100
Phone(617) 636-7010
Fax(617) 636-7100
Sole ProprietorYes
Medical School CMSOtherGraduated 2020
Enumeration DateApril 2, 2020
Last NPPES UpdateJuly 5, 20233 updates tracked since enumeration
NPPES CertifiedJuly 5, 2023
✔ NPI 1528697430 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyStudent in an Organized Health Care Education/Training ProgramStudent, Health Care
Taxonomy Code390200000X
License✔ Licensed in MA · 3013512
Definition
An individual who is enrolled in an organized health care education/training program leading to a degree, certification, registration, and/or licensure to provide health care.
800 WASHINGTON ST # 238, Boston, MA 02111
Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield.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

Warren William Acker Md 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 ID2163889965
PECOS Enrollment IDI20250829003277
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 Reassignment

Medicare enrollment records show Warren Acker reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Pratt Medical Group, Inc
Same address
Gastroenterology
800 WASHINGTON ST, BOX 1013
Boston, MA 02111
  • Reassigned Medicare billing, Massachusetts enrollment
  • 334 clinicians in this Medicare group
NPI 1013237809 (617) 636-5000

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

Hospital Affiliations CMS Care Compare 2

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

Lowell General Hospital

Acute Care Hospitals · Lowell, MA
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number220063
Location295 Varnum AvenueLowell, MA 01854 · Middlesex County
Emergency services Birthing friendly

Tufts Medical Center

Acute Care Hospitals · Boston, MA
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number220116
Location800 Washington StreetBoston, MA 02111 · Suffolk County
Emergency services Birthing friendly

Other Providers at the Same Location NPPES 10

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

AHMAD HAMDAN M.D.
Student in an Organized Health Care Education/Training Program
800 WASHINGTON ST # 238
BOSTON, MA 02111
Suffolk County (617) 636-7010
DR. OSCAR ALONSO GAYOSO LIVIAC MD
Student in an Organized Health Care Education/Training Program
800 WASHINGTON ST # 238
BOSTON, MA 02111
Suffolk County (617) 636-7010
DR. MICHAEL ALLEN SMITH MD
Student in an Organized Health Care Education/Training Program
800 WASHINGTON ST # 238
BOSTON, MA 02111
Suffolk County (617) 636-7010
ANTHONY JIA-YUE YEH D.O.
Student in an Organized Health Care Education/Training Program
800 WASHINGTON ST # 238
BOSTON, MA 02111
Suffolk County (617) 636-7010
ROOTUL KAKADIA DO
Student in an Organized Health Care Education/Training Program
800 WASHINGTON ST # 238
BOSTON, MA 02111
Suffolk County (617) 636-7010
MAHER JAFAR MD
Student in an Organized Health Care Education/Training Program
800 WASHINGTON ST # 238
BOSTON, MA 02111
Suffolk County (617) 636-7010
ANKITA SUBEDI M.D.
Internal Medicine
800 WASHINGTON ST # 238
BOSTON, MA 02111
Suffolk County (617) 636-7010
DR. RAHMA ALDHAHERI MD
Student in an Organized Health Care Education/Training Program
800 WASHINGTON ST # 238
BOSTON, MA 02111
Suffolk County (617) 636-7010

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 Warren Acker's NPI number?

The NPI number for Warren Acker is 1528697430. It was assigned to this individual provider in the NPPES registry on April 2, 2020.

Where is Warren Acker located?

Warren Acker practices at 800 Washington St # 238, Boston, MA 02111. The listed phone number is (617) 636-7010.

What is Warren Acker's specialty?

The primary specialty registered for this NPI is Student in an Organized Health Care Education/Training Program with taxonomy code 390200000X.

Is Warren Acker enrolled in Medicare?

Yes. Warren Acker 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 organization bills Medicare for Warren Acker's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Warren Acker reassigns Medicare benefits to Pratt Medical Group, Inc (Boston, MA). The 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 Warren Acker's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Warren Acker accept?

Health plans from Anthem Blue Cross and Blue Shield list Warren Acker 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 Warren Acker affiliated with any hospitals?

According to CMS data, Warren Acker is affiliated with Lowell General Hospital and Tufts Medical Center.

When was this NPI record last updated?

The NPPES record for Warren Acker was last updated on July 5, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years 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.