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CHAPARRAL MEDICAL GROUP INC
NPI 1376506956
Internal Medicine - Endocrinology, Diabetes & Metabolism in Claremont, CA

Active since April 06, 2006CLIA 05D0933196 · Waiver
138 HARVARD AVE, CHAPARRAL MEDICAL GROUP, CLAREMONT, CA 91711(909) 624-4503(909) 624-6364 Get Directions Write a Review

NPPES record last updated: April 18, 2022. Verified against the NPPES registry weekly; last sync: October 25, 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 1376506956) is a healthcare organization registered as an endocrinology, diabetes & metabolism in Claremont, California and active in the NPI registry since April 2006. The organization holds a CLIA Waiver certificate valid through September 7, 2027 and lists Adrienne M Walker, Contracts Administrator, as its authorized official.

NPPES Registry Identity

NPI1376506956
Entity TypeOrganization
Primary Taxonomy207RE0101X
Legal Business NameCHAPARRAL MEDICAL GROUP INC
Location Address138 HARVARD AVE, CHAPARRAL MEDICAL GROUPClaremont, CA 91711-4716
Mailing Address840 Towne Center Dr, Administrative ResourcesPomona, CA 91767-5900 · (909) 398-1550 · Fax (909) 398-1573
Phone(909) 624-4503
Fax(909) 624-6364
Organization SubpartNo
Authorized OfficialAdrienne M WalkerContracts Administrator · (909) 398-1550
Enumeration DateApril 6, 2006
Last NPPES UpdateApril 18, 2022
NPPES CertifiedApril 18, 2022
✔ NPI 1376506956 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal Medicine · Endocrinology, Diabetes & MetabolismAllopathic & Osteopathic Physicians
Taxonomy Code207RE0101X
Definition
An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems.
Also ListedInternal MedicineTaxonomy 207R00000X
Also ListedSurgeryTaxonomy 208600000X
138 HARVARD AVE, Claremont, CA 91711
Open in Google Maps ↗

Other Identifiers 1

MedicaidGR0052951CA

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

114

Medicare enrollment records show 114 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 85 within 10 miles. Listed here are the 20 practicing nearest to this location.

Clinicians by Medicare Specialty 28

Internal Medicine29
Cardiovascular Disease (Cardiology)11
Nurse Practitioner9
Family Practice7
Pulmonary Disease7
Endocrinology5
Gastroenterology5
Dermatology4
20 other specialties37

Nearest to this location (20)

See all 114
Ashok Sharma, MD
Internal Medicine
NPI 1205804580
138 HARVARD AVE
Claremont, CA 91711
(909) 624-4503
✔ PECOS✔ Accepts MedicareSame address
Alexandra Uribe, RD
Registered Dietitian or Nutrition Professional
NPI 1255180980
840 TOWNE CENTER DR
Pomona, CA 91767
(909) 624-0109
1.1 mi
Chan Aung, M.D.
Internal Medicine
NPI 1376949230
790 E BONITA AVE 2ND FLOOR
Pomona, CA 91767
(909) 447-8585
✔ PECOS✔ Accepts Medicare1.3 mi
April Ford, MD
Family Practice
NPI 1023045283
790 E BONITA AVE 2ND FLOOR
Pomona, CA 91767
(909) 447-8585
✔ PECOS✔ Accepts Medicare1.3 mi
Nazia Siddiqi, M.D.
Nephrology
NPI 1578879755
790 E BONITA AVE
Pomona, CA 91767
(909) 447-8585
✔ PECOS✔ Accepts Medicare1.3 mi
Seerat Anand, M.D.
Endocrinology
NPI 1417575085
790 E BONITA AVE FL 2
Pomona, CA 91767
(909) 447-8585
✔ PECOS✔ Accepts Medicare1.3 mi
Pramod Theetha Kariyanna, M.D.
Interventional Cardiology
NPI 1881005809
790 E BONITA AVE FL 2
Pomona, CA 91767
(909) 447-8585
✔ PECOS✔ Accepts Medicare1.3 mi
Miriam Schmidt Villanueva, MD
Pediatric Medicine
NPI 1689642092
790 E BONITA AVE FL 2
Pomona, CA 91767
(909) 447-8585
✔ PECOS1.3 mi
Heather Davis Kingston, MD
Pulmonary Disease
NPI 1154390391
1601 MONTE VISTA AVE STE 270
Claremont, CA 91711
(909) 865-9152
✔ PECOS✔ Accepts Medicare1.5 mi
Johanna Basa, M.D.
General Surgery
NPI 1821326380
520 E FOOTHILL BLVD STE C
Pomona, CA 91767
(909) 398-4835
✔ PECOS✔ Accepts Medicare1.6 mi
Preeti Chaudhary, M.D.
Hematology/Oncology
NPI 1255597456
1910 ROYALTY DRIVE
Pomona, CA 91767
(909) 630-7205
✔ PECOS✔ Accepts Medicare2.1 mi
Yallapragada Rao, M.D.
Radiation Oncology
NPI 1871503490
1910 ROYALTY DR
Pomona, CA 91767
(714) 865-9890
✔ PECOS2.1 mi
Guangqiang Gao, M.D
Cardiac Surgery
NPI 1124322086
1940 N ORANGE GROVE AVE STE B
Pomona, CA 91767
(909) 865-9099
✔ PECOS✔ Accepts Medicare2.2 mi
Jaffar Tremazi, MD
Rheumatology
NPI 1649248782
1904 N ORANGE GROVE AVE
Pomona, CA 91767
(909) 469-1823
✔ PECOS✔ Accepts Medicare2.2 mi
Nancy Ramirez, NP-C
Nurse Practitioner
NPI 1992185847
1880 N ORANGE GROVE AVE
Pomona, CA 91767
(909) 620-7200
✔ PECOS2.2 mi
Puneet Ghayal, M.D.
Cardiovascular Disease (Cardiology)
NPI 1336443100
1866 N ORANGE GROVE AVE SUITE # 202
Pomona, CA 91767
(909) 623-8796
✔ PECOS✔ Accepts Medicare2.2 mi
Lisa Raptis, M.D.
Hospice/Palliative Care
NPI 1902073802
1866 N ORANGE GROVE AVE STE 202
Pomona, CA 91767
(909) 623-8796
✔ PECOS✔ Accepts Medicare2.2 mi
Praveena Jeereddi, MD
Geriatric Medicine
NPI 1346218740
1880 N ORANGE GROVE AVE
Pomona, CA 91767
(909) 620-7200
✔ PECOS✔ Accepts Medicare2.2 mi
Omied Samiee, M.D.
Hospitalist
NPI 1952576381
1818 N ORANGE GROVE AVE SUITE 204
Pomona, CA 91767
(909) 620-7200
✔ PECOS2.3 mi
Sharyn Brekhus, M.D.
Neurosurgery
NPI 1003995093
160 E ARTESIA ST SUITE 220
Pomona, CA 91767
(909) 865-1020
✔ PECOS2.5 mi
See all 114 clinicians

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

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 05D0933196

Chaparral Medical Group Inc · Claremont, CA
Active · expires Sep 7, 2027
CLIA Number05D0933196
Laboratory TypePhysician Office
Certificate Effective DateSeptember 8, 2025
Certificate Expiration DateSeptember 7, 2027
Laboratory DirectorAshok Sharma MD
Laboratory Phone(909) 624-4503
Laboratory LocationChaparral Medical Group Inc138 Harvard Avenue, Claremont, CA 91711
CLIA data matches this NPI record on: Address Name Phone
This certificate is issued to a laboratory to perform only waived tests.

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 1376506956. It was assigned to this organization in the NPPES registry on April 6, 2006.

Where is Chaparral Medical Group Inc located?

Chaparral Medical Group Inc is located at 138 Harvard Ave Chaparral Medical Group, Claremont, CA 91711. The listed phone number is (909) 624-4503.

What is Chaparral Medical Group Inc's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.

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), 114 clinicians in 28 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 (29), Cardiovascular Disease (Cardiology) (11) and Nurse Practitioner (9). Of these, 1 practice at this address and 85 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Chaparral Medical Group Inc hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 05D0933196) is associated with this NPI, valid through September 7, 2027. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Chaparral Medical Group Inc was last updated on April 18, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.