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GREGORY S MONTGOMERY MD
NPI 1902915960
Pediatrics - Pediatric Pulmonology in Indianapolis, IN

Active since August 30, 2006PECOS EnrolledAccepts Medicare Assignment
705 RILEY HOSPITAL DR, ROC 4270, INDIANAPOLIS, IN 46202(317) 274-7208(317) 274-3442 Get Directions Write a Review

NPPES record last updated: February 6, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Feb 6, 2026, Dec 17, 2020 (2 updates tracked since 2020).

About Gregory S Montgomery Md NPPES

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

GREGORY S MONTGOMERY MD (NPI 1902915960) is an individual pediatric pulmonology provider in Indianapolis, Indiana, licensed in Indiana (01060650) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS, is affiliated with Indiana University Health, and is a graduate of Indiana University School Of Medicine (1998).

NPPES Registry Identity

NPI1902915960
Entity TypeIndividualMale
Primary Taxonomy2080P0214X
Provider Legal NameGREGORY S MONTGOMERYCredential: MD
Location Address705 RILEY HOSPITAL DR, ROC 4270Indianapolis, IN 46202-5109
Mailing AddressPo Box 719094Chicago, IL 60677-9318 · (317) 777-6435 · Fax (317) 777-6644
Phone(317) 274-7208
Fax(317) 274-3442
Sole ProprietorNo
Medical School CMSIndiana University School Of MedicineGraduated 1998
Enumeration DateAugust 30, 2006
Last NPPES UpdateFebruary 6, 20262 updates tracked since enumeration
NPPES CertifiedFebruary 6, 2026
✔ NPI 1902915960 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatrics · Pediatric PulmonologyAllopathic & Osteopathic Physicians
Taxonomy Code2080P0214X
License✔ Licensed in IN · 01060650
Definition
A pediatrician dedicated to the prevention and treatment of all respiratory diseases affecting infants, children and young adults. This specialist is knowledgeable about the growth and development of the lung, assessment of respiratory function in infants and children, and experienced in a variety of invasive and noninvasive diagnostic techniques.
705 RILEY HOSPITAL DR, Indianapolis, IN 46202
Open in Google Maps ↗

Other Identifiers 2

Medicaid200515500IN
Medicaid7100037240KY

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Buckeye Health Plan, Ambetter from Meridian, Ambetter Health and more.Insurance ›

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

Gregory S Montgomery Md 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 ID1951381813
PECOS Enrollment IDI20050809000447
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 Gregory Montgomery reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Iu Health Medical Group Riley Specialists, LLC
Same address
Pediatrics
705 RILEY HOSPITAL DR
Indianapolis, IN 46202
  • Reassigned Medicare billing, Indiana enrollment
  • 523 clinicians in this Medicare group
NPI 1699561480 (317) 944-5000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Hospital Affiliations CMS Care Compare

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

Indiana University Health

Acute Care Hospitals · Indianapolis, IN
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number150056
Location1701 N Senate BlvdIndianapolis, IN 46202 · Marion County
Emergency services Birthing friendly

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.

MOHANNAD MOALLEM M.D.
Pediatrics (Neonatal-Perinatal Medicine)
705 RILEY HOSPITAL DR
INDIANAPOLIS, IN 46202
Marion County (317) 274-4779
TIA IMHOFF MCGEE FNP-BC
Nurse Practitioner (Family)
705 RILEY HOSPITAL DR
INDIANAPOLIS, IN 46202
Marion County (317) 312-2204
JOSHUA WAYNE GOLLUB
Pediatrics (Neonatal-Perinatal Medicine)
705 RILEY HOSPITAL DR
INDIANAPOLIS, IN 46202
Marion County (317) 274-4779
NOAH MENAKER DDS
Dentist (Pediatric Dentistry)
705 RILEY HOSPITAL DR
INDIANAPOLIS, IN 46202
Marion County (317) 944-3865
DR. ANAS NADER ATA ALJABARI MBBS
Student in an Organized Health Care Education/Training Program
705 RILEY HOSPITAL DR
INDIANAPOLIS, IN 46202
Marion County (856) 398-9630
TALIA RAE BOOHER MB BCH BAO
Student in an Organized Health Care Education/Training Program
705 RILEY HOSPITAL DR
INDIANAPOLIS, IN 46202
Marion County (317) 944-7571
JANET R SHAVER NP
Nurse Practitioner (Pediatrics)
705 RILEY HOSPITAL DR, RI 1601
INDIANAPOLIS, IN 46202
Marion County (317) 944-4842
UNIVERSITY PEDIATRIC DENTISTRY ASSOCIATES
Dentist (Pediatric Dentistry)
705 RILEY HOSPITAL DR, ROC - SUITE 4205
INDIANAPOLIS, IN 46202
Marion County (317) 944-9604

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 Gregory Montgomery's NPI number?

The NPI number for Gregory Montgomery is 1902915960. It was assigned to this individual provider in the NPPES registry on August 30, 2006.

Where is Gregory Montgomery located?

Gregory Montgomery practices at 705 Riley Hospital Dr Roc 4270, Indianapolis, IN 46202. The listed phone number is (317) 274-7208.

What is Gregory Montgomery's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Pulmonology, with taxonomy code 2080P0214X.

Is Gregory Montgomery enrolled in Medicare?

Yes. Gregory Montgomery 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 organization bills Medicare for Gregory Montgomery's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Montgomery reassigns Medicare benefits to Iu Health Medical Group Riley Specialists, LLC (Indianapolis, IN). 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 Gregory Montgomery's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Gregory Montgomery accept?

Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter from Meridian, Anthem Blue Cross and Blue Shield and CareSource and 2 other insurers list Gregory Montgomery 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.

Is Gregory Montgomery affiliated with any hospitals?

According to CMS data, Gregory Montgomery is affiliated with Indiana University Health.

When was this NPI record last updated?

The NPPES record for Gregory Montgomery was last updated on February 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.