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UNITED HOSPITALIST INC.
NPI 1700908480
Internal Medicine in Rancho Cucamonga, CA

Active since April 04, 2007
7974 HAVEN AVE STE 210, RANCHO CUCAMONGA, CA 91730(909) 941-0661 Get Directions Write a Review

NPPES record last updated: October 20, 2023. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Oct 20, 2023, Aug 22, 2020 (2 updates tracked since 2020).

About United Hospitalist Inc. NPPES

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

UNITED HOSPITALIST INC. (NPI 1700908480) is a healthcare organization registered as an internal medicine in Rancho Cucamonga, California and active in the NPI registry since April 2007. The organization lists Carlos Vigil, President/ceo, as its authorized official.

NPPES Registry Identity

NPI1700908480
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameUNITED HOSPITALIST INC.
Location Address7974 HAVEN AVE STE 210Rancho Cucamonga, CA 91730-3052
Mailing Address9625 Monte Vista Ave, Suite 103Montclair, CA 91763-2234 · (909) 625-1955
Phone(909) 941-0661
Organization SubpartNo
Authorized OfficialCarlos VigilPresident/ceo · (909) 625-1955
Enumeration DateApril 4, 2007
Last NPPES UpdateOctober 20, 20232 updates tracked since enumeration
NPPES CertifiedOctober 20, 2023
✔ NPI 1700908480 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ 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.
7974 HAVEN AVE STE 210, Rancho Cucamonga, CA 91730
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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE 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)

United Hospitalist Inc. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

18

Medicare enrollment records show 18 clinicians reassign Medicare billing to United Hospitalist Inc., which bills Medicare for the services they deliver. Of these, 3 practice at this address and 9 within 10 miles. They are listed nearest first.

Clinicians by Medicare Specialty 6

Internal Medicine12
Family Practice2
Hospitalist1
Interventional Nephrology1
Nephrology1
Pulmonary Disease1

Clinicians, nearest first (18)

Deepak Thiagarajan, MD
Hospitalist
NPI 1205052990
7974 HAVEN AVE STE 210
Rancho Cucamonga, CA 91730
(909) 881-5994
✔ PECOS✔ Accepts MedicareSame address
Carlos Vigil, DO
Internal Medicine
NPI 1366494015
7974 HAVEN AVE SUITE 210
Rancho Cucamonga, CA 91730
(909) 941-0661
✔ PECOS✔ Accepts MedicareSame address
Rishi Talwar, MD
Internal Medicine
NPI 1699184184
7974 HAVEN AVE STE 210
Rancho Cucamonga, CA 91730
(909) 941-0661
✔ PECOS✔ Accepts MedicareSame address
Ghassan Hadi, M.D.
Internal Medicine
NPI 1558497891
1060 E FOOTHILL BLVD SUITE 103
Upland, CA 91786
(909) 981-8904
✔ PECOS✔ Accepts Medicare3.5 mi
Azhar Majeed, MD, MBA, FACP
Internal Medicine
NPI 1295802155
1042 SAN BERNARDINO RD
Upland, CA 91786
(909) 524-1940
✔ PECOS✔ Accepts Medicare3.5 mi
Syed Rizvi, MD
Family Practice
NPI 1669677365
901 SAN BERNARDINO RD STE 104
Upland, CA 91786
(909) 946-0844
✔ PECOS✔ Accepts Medicare3.6 mi
Terence Rhone, D.O.
Pulmonary Disease
NPI 1932153582
141 W FOOTHILL BLVD
Upland, CA 91786
(909) 296-8800
✔ PECOS✔ Accepts Medicare4.4 mi
Mary Kasem, MD
Family Practice
NPI 1982639993
430 W BASELINE RD
Claremont, CA 91711
(909) 621-3916
✔ PECOS✔ Accepts Medicare8.3 mi
Ali Etemadian, D.O.
Internal Medicine
NPI 1316041718
5343 RIVERSIDE DR
Chino, CA 91710
(909) 591-6227
✔ PECOS✔ Accepts Medicare8.9 mi
Mansurur Khan, MD
Internal Medicine
NPI 1326196312
1940 N ORANGE GROVE AVE SUITE C
Pomona, CA 91767
(909) 524-1940
✔ PECOS✔ Accepts Medicare10 mi
Daryoosh Valamanesh, M.D.
Internal Medicine
NPI 1205804671
1904 N ORANGE GROVE AVE
Pomona, CA 91767
(909) 469-1823
✔ PECOS✔ Accepts Medicare10 mi
Nitin Chilakamarri, M.D.
Internal Medicine
NPI 1679951164
1880 N ORANGE GROVE AVE
Pomona, CA 91767
(909) 398-1550
✔ PECOS✔ Accepts Medicare10 mi
Gimha Gunawardana, M.D
Internal Medicine
NPI 1720274921
255 E BONITA AVE #101
Pomona, CA 91767
(909) 924-1940
✔ PECOS✔ Accepts Medicare10 mi
Zouhair Hakak, MD
Internal Medicine
NPI 1700876323
1330 W COVINA BLVD
San Dimas, CA 91773
(909) 267-9138
✔ PECOS✔ Accepts Medicare15 mi
Abid Rizvi, M.D.
Interventional Nephrology
NPI 1255582540
1335 CYPRESS ST STE 205
San Dimas, CA 91773
(909) 542-2777
✔ PECOS✔ Accepts Medicare15 mi
Krishi Chanduri, M.D.
Nephrology
NPI 1598957540
2057 COMPTON AVE STE 102
Corona, CA 92881
(951) 736-6757
✔ PECOS✔ Accepts Medicare18 mi
Sheeba Anand, MD
Internal Medicine
NPI 1003131590
325 N STATE OF FRANKLIN
Johnson City, TN 37614
(423) 439-6283
✔ PECOS✔ Accepts Medicare1,986 mi
Adiofel Mark Mendoza, M.D.
Internal Medicine
NPI 1144631623
99 BEAUVOIR AVE
Summit, NJ 07901
(908) 522-2000
✔ PECOS✔ Accepts Medicare2,396 mi

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 United Hospitalist Inc.'s NPI number?

The NPI number for United Hospitalist Inc. is 1700908480. It was assigned to this organization in the NPPES registry on April 4, 2007.

Where is United Hospitalist Inc. located?

United Hospitalist Inc. is located at 7974 Haven Ave Ste 210, Rancho Cucamonga, CA 91730. The listed phone number is (909) 941-0661.

What is United Hospitalist Inc.'s specialty?

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

Is United Hospitalist Inc. enrolled in Medicare?

Yes. United Hospitalist Inc. is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through United Hospitalist Inc.?

According to the CMS Revalidation Reassignment List (October 2026 release), 18 clinicians in 6 Medicare specialties reassign their Medicare billing to United Hospitalist 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 (12), Family Practice (2) and Hospitalist (1). Of these, 3 practice at this address and 9 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 United Hospitalist Inc. was last updated on October 20, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.