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ROBERT GRENN MD
NPI 1366079915
Psychiatry & Neurology - Psychiatry in Caro, MI

Active since March 24, 2020PECOS Enrolled
2040 CHAMBERS RD, CARO, MI 48723(989) 673-3191 Get Directions Write a Review

NPPES record last updated: April 11, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Apr 11, 2026, Jun 4, 2024, May 18, 2020 and 1 more (4 updates tracked since 2020).

About Robert Grenn Md NPPES

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

ROBERT GRENN MD (NPI 1366079915) is an individual psychiatry provider in Caro, Michigan, licensed in Michigan (4301508925) and active in the NPI registry since March 2020. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1366079915
Entity TypeIndividualMale
Primary Taxonomy2084P0800X
Provider Legal NameROBERT GRENNCredential: MD
Location Address2040 CHAMBERS RDCaro, MI 48723-9240
Mailing Address2040 Chambers RdCaro, MI 48723-9240 · (989) 673-3191
Phone(989) 673-3191
Sole ProprietorYes
Enumeration DateMarch 24, 2020
Last NPPES UpdateApril 11, 20264 updates tracked since enumeration
NPPES CertifiedApril 11, 2026
✔ NPI 1366079915 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0800X
License✔ Licensed in MI · 4301508925
Definition
A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.
2040 CHAMBERS RD, Caro, MI 48723
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Robert Grenn Md 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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 48723 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
$166.68 typical visit price
range $54.34 – $166.68
Typical copayment $41.67 (range $13.58 – $41.67)
Most-billed visit code 99205
Established Patient
$68.07 typical visit price
range $17.09 – $135.40
Typical copayment $17.01 (range $4.27 – $33.85)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 4

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

STATE OF MICHIGAN OFFICE OF FINANCIAL MANAGEMENT
Psychiatric Hospital
2040 CHAMBERS RD
CARO, MI 48723
Tuscola County (989) 672-9261
JENNIFER LENCHNER DO
Psychiatry & Neurology (Psychiatry)
2040 CHAMBERS RD
CARO, MI 48723
Tuscola County (989) 672-9261
JANELLE LINDOW D.O.
Family Medicine
2040 CHAMBERS RD
CARO, MI 48723
Tuscola County (800) 835-2362
NICOLE HORNEBER OTRL
Occupational Therapist
2040 CHAMBERS RD
CARO, MI 48723
Tuscola County (989) 233-6104

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 Robert Grenn's NPI number?

The NPI number for Robert Grenn is 1366079915. It was assigned to this individual provider in the NPPES registry on March 24, 2020.

Where is Robert Grenn located?

Robert Grenn practices at 2040 Chambers Rd, Caro, MI 48723. The listed phone number is (989) 673-3191.

What is Robert Grenn's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Is Robert Grenn enrolled in Medicare?

Yes. Robert Grenn is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Robert Grenn was last updated on April 11, 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.