DR. MATTHEW MICHAEL GRINSELL (M.D., PH.D.) – Pediatric Nephrology Physician, NPI 1346364429

Pediatric Nephrology Physician

DR. MATTHEW MICHAEL GRINSELL (M.D., PH.D.) is a healthcare provider. based in Salt lake city, Utah. specializing in PEDIATRIC MEDICINE, NEPHROLOGY. They hold the professional credentials M.D., PH.D.. They hold a License No. 65474331205 (UT). The NPI Number for DR. MATTHEW MICHAEL GRINSELL (M.D., PH.D.) is 1346364429

Main info

Male

26 Years Of Experience

Accepts Medicare Assignment

Name

DR. MATTHEW MICHAEL GRINSELL (M.D., PH.D.)

NPI

1346364429

Phone

(801) 587-7575

Address

100 MARIO CAPECCHI DR

Enumeration Date

16 March 2007

Last Update Date

10 December 2021

Doctor Profile

Medical School Name

UNIVERSITY OF NEVADA SCHOOL OF MEDICINE

Secondary Phone

8012133599

Graduation Year

2000 (26 years ago)

PAC ID

3870678469

Group Practice PAC ID

0547552473

Professional Enrollment ID

I20080306000368

Address ID

UT841131125SA81XXXDRXX500

Contacts

Secure Messaging

mgrinsell35550@direct.med.utah.edu

Data current as of

19 May 2026

Profile Insights

NPPES metrics only — not quality of care.

Methodology

Experience62

Completeness85

Years active:19State licenses:1Other namesUpdated within 12 months

279 PEDIATRIC MEDICINE in UT

Provider Addresses for DR. MATTHEW MICHAEL GRINSELL (M.D., PH.D.)

100 MARIO CAPECCHI DR
SALT LAKE CITY, UT 841131103
Phone: (801) 587-7575
Fax: (801) 581-8043
Type: Location
PO BOX 413021
SALT LAKE CITY, UT 841413021
Phone: (801) 213-3900
Fax: (801) 585-3655
Type: Mailing

NPPES updates history

No NPPES updates recorded for this provider.

Prescription Activity

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Open Payments (CMS)

No Open Payments data available for this provider.

This can happen when there are no reportable CMS Open Payments records.

Medicare Enrollment & Revalidation

Source: CMS public data · Not endorsed by CMS ·

Educational use only—not medical, billing, or legal advice.

PECOS enrollment status

Participating (accepts Medicare assignment)

Enrollment effective: 2019-04-22

PECOS data refreshed: 2026-05-27

Medicare revalidation (CMS due date list)

Due date not assigned yet

CMS is tracking 2 Medicare enrollment records; no due dates published yet.

Enrollment records

Earliest due date

Not assigned (TBD)

CMS data updated

2026-06-01

Revalidation progress

Medicare enrolled
On CMS revalidation list
Due date assigned
Revalidate in PECOS

CMS enrollment records

Enrollment ID	Type	Specialty	State	Due date
I20080306000368	I	Pediatric Medicine	UT	TBD
I20190422000970	I	Pediatric Medicine	MT	TBD

What to do next

No action required while the due date shows TBD.
Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.

Verify on CMS Revalidation Lookup Tool

Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS

Medicare Utilization (FFS)

Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·

Educational use only—not medical, billing, or legal advice.

No Medicare fee-for-service utilization data available for this provider in our database.

Insurance plans in this area (ZIP 84113)

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Group practice members

Group practice members are other physicians who share the same Group Practice PAC ID with this doctor. When doctors form a group practice and register in PECOS as a single entity, they receive a shared identification number. This table lists all providers in the same group practice.

PAC ID: 0547552473View full group profile

Name	Specialty	State
DR. ROBERT JOHN BOLLO (MD)	N E U R O S U R G E R Y	UT
MARY HUNT MARTIN (MD)	Pediatric Medicine, Cardiovascular Disease (Cardiology)	UT
DR. JACOB O ROBSON (MD)	Pediatric Medicine	UT
RICHARD SCOTT LEMONS	-	UT
AARON ECKHAUSER (MD)	-	UT
DR. LEAH ANNE OWEN (MD/PHD)	-	OH
ZEINAB AM AFIFY	-	UT
ABBEY JO BENTLEY (MSN, CPNP, PMHNP-BC)	-	UT
WINIFRED L HOBSON (MD)	-	UT
HARLAN RAY MUNTZ (MD)	-	UT

Reviews

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Frequently asked questions

How do payers reference DR. MATTHEW MICHAEL GRINSELL (M.D., PH.D.)?

For DR. MATTHEW MICHAEL GRINSELL (M.D., PH.D.), use NPI 1346364429 as the unique 10-digit identifier.

Is DR. MATTHEW MICHAEL GRINSELL (M.D., PH.D.) shown as active in public data?

Registry records indicate DR. MATTHEW MICHAEL GRINSELL (M.D., PH.D.) maintains an active NPI.

How would a patient describe DR. MATTHEW MICHAEL GRINSELL (M.D., PH.D.)'s focus?

For DR. MATTHEW MICHAEL GRINSELL (M.D., PH.D.), the primary taxonomy reads as Pediatric Nephrology Physician. Clinical services aligned with this taxonomy classification.

What practice footprint exists for DR. MATTHEW MICHAEL GRINSELL (M.D., PH.D.)?

Travel planning: use Salt Lake City, Utah as the reference point for DR. MATTHEW MICHAEL GRINSELL (M.D., PH.D.), then confirm.

When was this NPI issued?

Enumeration for DR. MATTHEW MICHAEL GRINSELL (M.D., PH.D.) is noted as March 16, 2007 where the registry provides it.