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DR. WILLIAM SPENCER GRIGG D.O.
NPI 1578050266
Internal Medicine in Rochester, NY

Active since April 18, 2018PECOS EnrolledAccepts Medicare Assignment
88.22/100
CMS Quality Rating
601 ELMWOOD AVENUE, BOX 679, ROCHESTER, NY 14642(858) 275-4290(585) 473-1573 Get Directions Write a Review

NPPES record last updated: July 22, 2024. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Jul 22, 2024, Jan 26, 2022, Jan 19, 2022 and 2 more (5 updates tracked since 2018).

About Dr. William Spencer Grigg D.o. NPPES

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

DR. WILLIAM SPENCER GRIGG D.O. (NPI 1578050266) is an individual internal medicine provider in Rochester, New York, licensed in Colorado (DR.0062850) and active in the NPI registry since April 2018. He is enrolled in Medicare PECOS and is a graduate of Other (2018).

NPPES Registry Identity

NPI1578050266
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. WILLIAM SPENCER GRIGGCredential: D.O.
Location Address601 ELMWOOD AVENUE, BOX 679Rochester, NY 14642
Mailing Address601 Elmwood Avenue, Box 679Rochester, NY 14642 · (858) 275-4290 · Fax (585) 473-1573
Phone(858) 275-4290
Fax(585) 473-1573
Sole ProprietorNo
Medical School CMSOtherGraduated 2018
Enumeration DateApril 18, 2018
Last NPPES UpdateJuly 22, 20245 updates tracked since enumeration
NPPES CertifiedJanuary 26, 2022
✔ NPI 1578050266 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Licenses✔ Licensed in CO · DR.0062850✔ Licensed in CO · TL.0007279
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.
Also ListedHospitalistTaxonomy 208M00000X · License DR.0062850 (CO)
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X · License TL.0007279 (CO)
601 ELMWOOD AVENUE, Rochester, NY 14642
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Kansas, Inc., Oscar Health Maintenance Organization of Florida, Oscar Insurance Company.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

Dr. William Spencer Grigg D.o. 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 ID9234476300
PECOS Enrollment IDI20260413000737
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.

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
48 services47 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 services17 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 14642 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
$126.40 typical visit price
range $54.87 – $166.88
Typical copayment $31.60 (range $13.71 – $41.72)
Most-billed visit code 99204
Established Patient
$97.08 typical visit price
range $17.54 – $136.14
Typical copayment $24.27 (range $4.38 – $34.03)
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.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

88.22/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality88.96
Promoting Interoperability81
Improvement Activities40

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.

XIAOLAN OU MD
Pathology (Anatomic Pathology & Clinical Pathology)
601 ELMWOOD AVENUE, UNIVERSITY OF ROCHESTER MEDICAL CENTER
ROCHESTER, NY 14642
Monroe County (585) 275-3191
YU WING YEUNG M.D.
Pathology (Anatomic Pathology & Clinical Pathology)
601 ELMWOOD AVENUE
ROCHESTER, NY 14642
Monroe County (585) 275-5662
MRS. BETH ANNE DELPAPA NP
Nurse Practitioner (Family)
601 ELMWOOD AVENUE, BOX 679-Y
ROCHESTER, NY 14642
Monroe County (585) 275-4775
DR. RAVINDER SIDHU M.D.
Radiology (Diagnostic Radiology)
601 ELMWOOD AVENUE
ROCHESTER, NY 14642
Monroe County (585) 275-2734
CHUNKIT FUNG M.D.
Internal Medicine (Hematology & Oncology)
601 ELMWOOD AVENUE
ROCHESTER, NY 14642
Monroe County (585) 275-5823
DR. PHUONG-LAN THI NGUYEN MD
Pathology (Anatomic Pathology & Clinical Pathology)
601 ELMWOOD AVENUE
ROCHESTER, NY 14642
Monroe County (585) 758-0510
MOUNIR FAKHOURI M.D.
Student in an Organized Health Care Education/Training Program
601 ELMWOOD AVENUE
ROCHESTER, NY 14642
Monroe County (585) 275-2100
SHANTE WHITE M.D.
Anesthesiology (Pediatric Anesthesiology)
601 ELMWOOD AVENUE
ROCHESTER, NY 14642
Monroe County (585) 275-1385

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 William Grigg's NPI number?

The NPI number for William Grigg is 1578050266. It was assigned to this individual provider in the NPPES registry on April 18, 2018.

Where is William Grigg located?

William Grigg practices at 601 Elmwood Avenue Box 679, Rochester, NY 14642. The listed phone number is (858) 275-4290.

What is William Grigg's specialty?

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

Is William Grigg enrolled in Medicare?

Yes. William Grigg 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.

What insurance does William Grigg accept?

Health plans from Blue Cross and Blue Shield of Kansas, Inc., Oscar Health Maintenance Organization of Florida and Oscar Insurance Company list William Grigg 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.

When was this NPI record last updated?

The NPPES record for William Grigg was last updated on July 22, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.