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DR. GREIGSTONE MONTGOMERY YEARWOOD M.D.
NPI 1689631640
Internal Medicine in Woonsocket, RI

Active since April 26, 2006PECOS EnrolledAccepts Medicare Assignment
191 SOCIAL ST STE 840, WOONSOCKET, RI 02895(401) 762-2535(401) 762-2858 Get Directions Write a Review

NPPES record last updated: July 16, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. Greigstone Montgomery Yearwood M.d. NPPES

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

DR. GREIGSTONE MONTGOMERY YEARWOOD M.D. (NPI 1689631640) is an individual internal medicine provider in Woonsocket, Rhode Island, licensed in Rhode Island (MD07911) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS, is affiliated with Landmark Medical Center, and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1689631640
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. GREIGSTONE MONTGOMERY YEARWOODCredential: M.D.
Location Address191 SOCIAL ST STE 840Woonsocket, RI 02895-3213
Mailing Address191 Social St Ste 840Woonsocket, RI 02895-3213 · (401) 762-2535 · Fax (401) 762-2858
Phone(401) 762-2535
Fax(401) 762-2858
Sole ProprietorYes
Medical School CMSOtherGraduated 1988
Enumeration DateApril 26, 2006
Last NPPES UpdateJuly 16, 2026
NPPES CertifiedJuly 16, 2026
✔ NPI 1689631640 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 · MD07911
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.
191 SOCIAL ST STE 840, Woonsocket, RI 02895
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Secondary Practice Locations 2

Location 120 Cumberland Hill Rd Unit 202Woonsocket, RI 02895-4854 · Phone (401) 488-4003
Location 2115 Cass AveWoonsocket, RI 02895-4705 · Phone (401) 769-4100

Other Identifiers 1

Medicaid9020093RI

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. Greigstone Montgomery Yearwood 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 ID9032205828
PECOS Enrollment IDI20101207000878
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 Greigstone Yearwood reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Blackstone Valley Center For Internal Medicine, Inc
Same address
Primary Care
191 SOCIAL ST, SUITE 840
Woonsocket, RI 02895
  • Reassigned Medicare billing, Rhode Island enrollment
NPI 1659338655 (401) 762-2535
Prime Healthcare Services Landmark LLC
0.8 mi
Hematology & Oncology
219 CASS AVE
Woonsocket, RI 02895
  • Reassigned Medicare billing, Rhode Island enrollment
  • 119 clinicians in this Medicare group
NPI 1518388651 (401) 769-4100

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 6

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.

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.
133 services133 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.
120 services80 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.
44 services13 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.
28 services26 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
20 services17 patients
Hospital discharge day management, more than 30 minutes 99239
Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.
20 services16 patients

Hospital Affiliations CMS Care Compare 2

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

Landmark Medical Center

Acute Care Hospitals · Woonsocket, RI
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number410011
Location115 Cass AvenueWoonsocket, RI 02895 · Providence County
Emergency services Birthing friendly

The Miriam Hospital

Acute Care Hospitals · Providence, RI
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number410012
Location164 Summit AvenueProvidence, RI 02906 · Providence County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 02895 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.

Referred Medical Equipment & Supplies CMS DME claims 3

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253
DME-Other DME · category DE017N
8 suppliers33 claims75 services$4.83 avg. paid by Medicare
Insulin for administration through dme (i.e., insulin pump) per 50 units J1817
Treatment-Injections and Infusions (nononcologic) · category RI000N
1 supplier11 claims1,100 services$7.32 avg. paid by Medicare
Supply allowance for therapeutic continuous glucose monitor (cgm), includes all supplies and accessories, 1 month supply = 1 unit of service K0553
DME-Other DME · category DE017N
4 suppliers30 claims30 services$179.22 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

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 Greigstone Yearwood's NPI number?

The NPI number for Greigstone Yearwood is 1689631640. It was assigned to this individual provider in the NPPES registry on April 26, 2006.

Where is Greigstone Yearwood located?

Greigstone Yearwood practices at 191 Social St Ste 840, Woonsocket, RI 02895. The listed phone number is (401) 762-2535.

What is Greigstone Yearwood's specialty?

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

Is Greigstone Yearwood enrolled in Medicare?

Yes. Greigstone Yearwood 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 Greigstone Yearwood's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Greigstone Yearwood reassigns Medicare benefits to 2 organizations: Blackstone Valley Center For Internal Medicine, Inc (Woonsocket, RI) and Prime Healthcare Services Landmark LLC (Woonsocket, RI). 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 Greigstone Yearwood's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Greigstone Yearwood affiliated with any hospitals?

According to CMS data, Greigstone Yearwood is affiliated with Landmark Medical Center and The Miriam Hospital.

When was this NPI record last updated?

The NPPES record for Greigstone Yearwood was last updated on July 16, 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.