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MARK SHANNON M.D.
NPI 1508941089
Internal Medicine in Barrington, RI

Active since October 25, 2006PECOS Enrolled
42 LINCOLN AVE, BARRINGTON, RI 02806(401) 246-0389 Get Directions Write a Review

NPPES record last updated: June 12, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Mark Shannon M.d. NPPES

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

MARK SHANNON M.D. (NPI 1508941089) is an individual internal medicine provider in Barrington, Rhode Island, licensed in Rhode Island (MD7250) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS and maintains a secondary practice location in Pascoag.

NPPES Registry Identity

NPI1508941089
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameMARK SHANNONCredential: M.D.
Location Address42 LINCOLN AVEBarrington, RI 02806-2136
Mailing Address42 Lincoln AveBarrington, RI 02806-2136 · (401) 246-0389
Phone(401) 246-0389
Sole ProprietorYes
Enumeration DateOctober 25, 2006
Last NPPES UpdateJune 12, 2026
NPPES CertifiedJune 12, 2026
✔ NPI 1508941089 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in RI · MD7250
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
42 LINCOLN AVE, Barrington, RI 02806
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Secondary Practice Location 1

Location 12090 Wallum Lake RdPascoag, RI 02859-1813 · Phone (401) 567-5400

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mark Shannon M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Shannon reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Prospect Chartercare Sjhsri, LLC
9.9 mi
Internal Medicine
200 HIGH SERVICE AVE
North Providence, RI 02904
  • Reassigned Medicare billing, Rhode Island enrollment
  • 110 clinicians in this Medicare group
NPI 1588089759 (401) 456-3000

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 02806 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
$134.17 typical visit price
range $58.57 – $177.03
Typical copayment $33.54 (range $14.64 – $44.25)
Most-billed visit code 99204
Established Patient
$103.10 typical visit price
range $18.92 – $144.38
Typical copayment $25.77 (range $4.73 – $36.09)
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.

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 Shannon's NPI number?

The NPI number for Mark Shannon is 1508941089. It was assigned to this individual provider in the NPPES registry on October 25, 2006.

Where is Mark Shannon located?

Mark Shannon practices at 42 Lincoln Ave, Barrington, RI 02806. The listed phone number is (401) 246-0389.

What is Mark Shannon's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Mark Shannon enrolled in Medicare?

Yes. Mark Shannon is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Mark Shannon's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mark Shannon reassigns Medicare benefits to Prospect Chartercare Sjhsri, LLC (North Providence, RI). 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 Shannon's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Mark Shannon was last updated on June 12, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.