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CHAPARRAL MEDICAL GROUP INC
NPI 1447317938
Internal Medicine in Fontana, CA

Active since January 03, 2007
16465 SIERRA LAKES PARKWAY, SUITE 250 CHAPARRAL MEDICAL GROUP INC, FONTANA, CA 92336(909) 770-8640(909) 770-8650 Get Directions Write a Review

NPPES record last updated: October 10, 2007. Verified against the NPPES registry weekly; last sync: November 08, 2026.

About Chaparral Medical Group Inc NPPES

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

CHAPARRAL MEDICAL GROUP INC (NPI 1447317938) is a healthcare organization registered as an internal medicine in Fontana, California and active in the NPI registry since January 2007. The organization lists Adrienne M Walker, Contracts Administrator, as its authorized official.

NPPES Registry Identity

NPI1447317938
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameCHAPARRAL MEDICAL GROUP INC
Location Address16465 SIERRA LAKES PARKWAY, SUITE 250 CHAPARRAL MEDICAL GROUP INCFontana, CA 92336-1242
Mailing Address840 Towne Center Drive, Chaparral Medical Group IncPomona, CA 91767-5900 · (909) 398-1550 · Fax (909) 398-1573
Phone(909) 770-8640
Fax(909) 770-8650
Organization SubpartNo
Authorized OfficialAdrienne M WalkerContracts Administrator · (909) 398-1550
Enumeration DateJanuary 3, 2007
Last NPPES UpdateOctober 10, 2007
✔ NPI 1447317938 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
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 ListedFamily MedicineTaxonomy 207Q00000X
16465 SIERRA LAKES PARKWAY, Fontana, CA 92336
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Other Identifiers 2

MedicaidGR005295FCA
Medicare PINZZZ04782ZCA

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Chaparral Medical Group Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

99

Medicare enrollment records show 99 clinicians reassign Medicare billing to Chaparral Medical Group Inc, which bills Medicare for the services they deliver. Of these, 1 practice at this address and 14 within 10 miles. Listed here are the 20 practicing nearest to this location.

Clinicians by Medicare Specialty 22

Internal Medicine21
Nurse Practitioner15
Cardiovascular Disease (Cardiology)9
Pulmonary Disease7
Family Practice6
Dermatology4
Endocrinology4
General Surgery4
14 other specialties29

Nearest to this location (20)

See all 99
Alya Torna, MD
Family Practice
NPI 1306051024
16465 SIERRA LAKES PKWY STE 200
Fontana, CA 92336
(909) 429-2404
✔ PECOS✔ Accepts MedicareSame address
Paul Kim
Nurse Practitioner
NPI 1356208409
8330 RED OAK ST STE 201
Rancho Cucamonga, CA 91730
(909) 987-2528
✔ PECOS✔ Accepts Medicare7.5 mi
Aftab Qadir, MD
Internal Medicine
NPI 1851753545
8330 RED OAK ST STE 201
Rancho Cucamonga, CA 91730
(909) 987-2528
✔ PECOS✔ Accepts Medicare7.5 mi
Khader Abounasr, MD
Pulmonary Disease
NPI 1780884015
8330 RED OAK ST SUITE 201
Rancho Cucamonga, CA 91730
(909) 987-2528
✔ PECOS✔ Accepts Medicare7.5 mi
Harvey Cohen, MD
Internal Medicine
NPI 1972517423
8330 RED OAK ST STE 201
Rancho Cucamonga, CA 91730
(909) 987-2528
✔ PECOS✔ Accepts Medicare7.5 mi
Haritha Alla, M.D.
Cardiovascular Disease (Cardiology)
NPI 1487739835
8330 RED OAK ST STE 101
Rancho Cucamonga, CA 91730
(909) 987-4922
✔ PECOS✔ Accepts Medicare7.5 mi
Annie Nguyen, NP
Nurse Practitioner
NPI 1992580559
8330 RED OAK ST STE 101
Rancho Cucamonga, CA 91730
(909) 987-4922
✔ PECOS7.5 mi
Lydia Reyes, NP
Nurse Practitioner
NPI 1447552229
8330 RED OAK STREET STE 101
Rancho Cucamonga, CA 91730
(909) 987-4922
✔ PECOS7.5 mi
Nyein Tint, M.D.
Internal Medicine
NPI 1336533447
8330 RED OAK ST STE 201
Rancho Cucamonga, CA 91730
(909) 987-2528
✔ PECOS✔ Accepts Medicare7.5 mi
Ani Berberyan, M.D.
Family Practice
NPI 1700230224
9140 HAVEN AVE STE 112
Rancho Cucamonga, CA 91730
(909) 296-7800
✔ PECOS8.3 mi
Johnnie Woodson, M.D.
Dermatology
NPI 1780727750
9190 HAVEN AVE STE 210
Rancho Cucamonga, CA 91730
(909) 466-7779
✔ PECOS✔ Accepts Medicare8.3 mi
Maria Velma Yep, DNP, APRN, GNP-BC
Nurse Practitioner
NPI 1316090103
9190 HAVEN AVE STE 102
Rancho Cucamonga, CA 91730
(909) 527-8110
✔ PECOS8.3 mi
Nancy Meng, NP-C
Nurse Practitioner
NPI 1760134852
9170 HAVEN AVE STE 120
Rancho Cucamonga, CA 91730
(909) 476-8700
✔ PECOS✔ Accepts Medicare8.3 mi
Kavoos Nazeri, M.D.
Rheumatology
NPI 1477731644
9170 HAVEN AVE STE 120
Rancho Cucamonga, CA 91730
(909) 466-0550
✔ PECOS✔ Accepts Medicare8.3 mi
Mysore Nagaraja, M.D.
Gastroenterology
NPI 1760451298
811 E 11TH ST STE 208
Upland, CA 91786
(909) 982-2279
✔ PECOS✔ Accepts Medicare11 mi
Donna Dudziak, M.D.
General Surgery
NPI 1275630568
901 SAN BERNARDINO RD STE 301
Upland, CA 91786
(909) 946-6221
✔ PECOS✔ Accepts Medicare11 mi
Peter Niciforos, M.D.
Family Practice
NPI 1356359277
330 N D ST STE 300
San Bernardino, CA 92401
(909) 888-6602
✔ PECOS12 mi
Sarika Jain, M.D.
Cardiac Surgery
NPI 1205846250
11234 ANDERSON ST
Loma Linda, CA 92354
(909) 558-4000
✔ PECOS✔ Accepts Medicare12 mi
Padmini Tummala, MD
Cardiovascular Disease (Cardiology)
NPI 1669519500
914 W FOOTHILL BLVD STE A
Upland, CA 91786
(909) 285-6717
✔ PECOS✔ Accepts Medicare13 mi
Pratibha Kayastha
Nurse Practitioner
NPI 1942601281
585 N MOUNTAIN AVE SUITE A
Upland, CA 91786
(909) 946-2228
✔ PECOS13 mi
See all 99 clinicians

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

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 Chaparral Medical Group Inc's NPI number?

The NPI number for Chaparral Medical Group Inc is 1447317938. It was assigned to this organization in the NPPES registry on January 3, 2007.

Where is Chaparral Medical Group Inc located?

Chaparral Medical Group Inc is located at 16465 Sierra Lakes Parkway Suite 250 Chaparral Medical Group Inc, Fontana, CA 92336. The listed phone number is (909) 770-8640.

What is Chaparral Medical Group Inc's specialty?

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

Is Chaparral Medical Group Inc enrolled in Medicare?

Yes. Chaparral Medical Group Inc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Chaparral Medical Group Inc?

According to the CMS Revalidation Reassignment List (October 2026 release), 99 clinicians in 22 Medicare specialties reassign their Medicare billing to Chaparral Medical Group Inc. A 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 the clinician's services. The largest specialties are Internal Medicine (21), Nurse Practitioner (15) and Cardiovascular Disease (Cardiology) (9). Of these, 1 practice at this address and 14 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Chaparral Medical Group Inc was last updated on October 10, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.