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DR. MARK S LEWIS M.D.
NPI 1942282280
Anesthesiology in Boston, MA

Active since November 14, 2005PECOS EnrolledAccepts Medicare Assignment
800 WASHINGTON ST, #298, BOSTON, MA 02111(617) 636-5000(617) 636-1465 Get Directions Write a Review

NPPES record last updated: April 27, 2017. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Apr 27, 2017, Oct 25, 2016 (2 updates tracked since 2016).

About Dr. Mark S Lewis M.d. NPPES

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

DR. MARK S LEWIS M.D. (NPI 1942282280) is an individual anesthesiology provider in Boston, Massachusetts, licensed in Massachusetts (55261) and active in the NPI registry since November 2005. He is enrolled in Medicare PECOS, is affiliated with Tufts Medical Center, and is a graduate of Js Weill Medical College, Cornell University (1983).

NPPES Registry Identity

NPI1942282280
Entity TypeIndividualMale
Primary Taxonomy207L00000X
Provider Legal NameDR. MARK S LEWISCredential: M.D.
Location Address800 WASHINGTON ST, #298Boston, MA 02111
Mailing Address800 Washington Street, #298Boston, MA 02111 · (617) 636-5000 · Fax (617) 636-1465
Phone(617) 636-5000
Fax(617) 636-1465
Sole ProprietorNo
Medical School CMSJs Weill Medical College, Cornell UniversityGraduated 1983
Enumeration DateNovember 14, 2005
Last NPPES UpdateApril 27, 20172 updates tracked since enumeration
✔ NPI 1942282280 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians
Taxonomy Code207L00000X
License✔ Licensed in MA · 55261
Definition
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.
800 WASHINGTON ST, Boston, MA 02111
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Other Identifiers 9

Other2000005MA · United Healthcare
OtherJ05103LEMA · Blue Cross/shield Ma
Medicaid3050297MA
Medicare PINJ05103MA
Other82971MA · Aetna Us Healthcare
Other055261MA · Tufts Healthplan
Other613824MA · Harvard Pilgrim Healthcar
Other5586023MA · Aetna
Medicare UPIND72365MA

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Taro 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. Mark S Lewis M.d. 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 ID1456307784
PECOS Enrollment IDI20050329001238
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 Mark Lewis reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Pratt Anesthesiology Associates, Inc
Same address
Anesthesiology
800 WASHINGTON ST, BOX 1013
Boston, MA 02111
  • Reassigned Medicare billing, Massachusetts enrollment
  • 246 clinicians in this Medicare group
NPI 1326085390 (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

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

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 20

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

AARON DICKSTEIN M.D.
Internal Medicine (Gastroenterology)
800 WASHINGTON ST, BOX 233
BOSTON, MA 02111
Suffolk County (617) 636-5883
THOMAS E BIGELOW
Technician/Technologist (Optician)
800 WASHINGTON ST, BOX 450
BOSTON, MA 02111
Suffolk County (617) 636-5857
SARAH MERRIMAN PERSING M.D.
Plastic Surgery
800 WASHINGTON ST
BOSTON, MA 02111
Suffolk County (617) 636-5000
DR. SHARANYA MOHANTY M.D.
Internal Medicine
800 WASHINGTON ST
BOSTON, MA 02111
Suffolk County (617) 636-5000
AFRAH SADIQ SAIT MOHAMMED M.D.
Internal Medicine (Infectious Disease)
800 WASHINGTON ST
BOSTON, MA 02111
Suffolk County (718) 629-7204
ADNAN SALIM QAMAR MD
Student in an Organized Health Care Education/Training Program
800 WASHINGTON ST
BOSTON, MA 02111
Suffolk County (617) 636-5829
ALICIA SIGIA WU MD
Psychiatry & Neurology (Psychiatry)
800 WASHINGTON ST
BOSTON, MA 02111
Suffolk County (617) 636-1619
ZEANAARONEVAN ANDRES LUNA
Student in an Organized Health Care Education/Training Program
800 WASHINGTON ST
BOSTON, MA 02111
Suffolk County (617) 636-8100

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 Mark Lewis's NPI number?

The NPI number for Mark Lewis is 1942282280. It was assigned to this individual provider in the NPPES registry on November 14, 2005.

Where is Mark Lewis located?

Mark Lewis practices at 800 Washington St #298, Boston, MA 02111. The listed phone number is (617) 636-5000.

What is Mark Lewis's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Is Mark Lewis enrolled in Medicare?

Yes. Mark Lewis 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 Mark Lewis's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mark Lewis reassigns Medicare benefits to Pratt Anesthesiology Associates, 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 Mark Lewis's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Mark Lewis accept?

Health plans from Taro Health list Mark Lewis 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 Mark Lewis affiliated with any hospitals?

According to CMS data, Mark Lewis is affiliated with Tufts Medical Center.

When was this NPI record last updated?

The NPPES record for Mark Lewis was last updated on April 27, 2017. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.