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DR. MARINA GRIGORIAN M.D.
NPI 1255452363
Hospitalist in Chattanooga, TN

Active since April 03, 2007PECOS Enrolled
2525 DE SALES AVE., MEMORIAL HOSPITAL, CHATTANOOGA, TN 37404(423) 495-2620 Get Directions Write a Review

NPPES record last updated: December 12, 2007. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Marina Grigorian M.d. NPPES

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

DR. MARINA GRIGORIAN M.D. (NPI 1255452363) is an individual hospitalist provider in Chattanooga, Tennessee, licensed in Tennessee (42962) and active in the NPI registry since April 2007. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1255452363
Entity TypeIndividualFemale
Primary Taxonomy208M00000X
Provider Legal NameDR. MARINA GRIGORIANCredential: M.D.
Location Address2525 DE SALES AVE., MEMORIAL HOSPITALChattanooga, TN 37404-1161
Mailing Address2525 De Sales Ave., Memorial HospitalChattanooga, TN 37404-1161 · (423) 495-2620
Phone(423) 495-2620
Sole ProprietorNo
Enumeration DateApril 3, 2007
Last NPPES UpdateDecember 12, 2007
✔ NPI 1255452363 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyHospitalistAllopathic & Osteopathic Physicians
Taxonomy Code208M00000X
License✔ Licensed in TN · 42962
Definition
Hospitalists are physicians whose primary professional focus is the general medical care of hospitalized patients. Their activities include patient care, teaching, research, and leadership related to Hospital Medicine. The term 'hospitalist' refers to physicians whose practice emphasizes providing care for hospitalized patients.
2525 DE SALES AVE., Chattanooga, TN 37404
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

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

App Of Tennessee Hm, PLLC
76 mi
Hospitalist
2835 HIGHWAY 231 N
Shelbyville, TN 37160
  • Reassigned Medicare billing, Tennessee enrollment
  • 498 clinicians in this Medicare group
NPI 1396160768 (931) 685-5433

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 37404 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
$121.80 typical visit price
range $52.64 – $160.89
Typical copayment $30.45 (range $13.16 – $40.22)
Most-billed visit code 99204
Established Patient
$93.60 typical visit price
range $16.72 – $131.41
Typical copayment $23.40 (range $4.18 – $32.85)
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.

Other Providers at the Same Location NPPES

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

MS. MORGAN PAIGE THOMPSON NP
Nurse Practitioner
2525 DE SALES AVE.
CHATTANOOGA, TN 37404
Hamilton County (423) 495-2525

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 Marina Grigorian's NPI number?

The NPI number for Marina Grigorian is 1255452363. It was assigned to this individual provider in the NPPES registry on April 3, 2007.

Where is Marina Grigorian located?

Marina Grigorian practices at 2525 De Sales Ave. Memorial Hospital, Chattanooga, TN 37404. The listed phone number is (423) 495-2620.

What is Marina Grigorian's specialty?

The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.

Is Marina Grigorian enrolled in Medicare?

Yes. Marina Grigorian is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Marina Grigorian's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Marina Grigorian reassigns Medicare benefits to App Of Tennessee Hm, PLLC (Shelbyville, TN). 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 Marina Grigorian'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 Marina Grigorian was last updated on December 12, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.