Internists in California

  • Internal medicine
  • California
Internists
18,948
Linked to a hospital or group
15,803
Hospitals with an internist
370
Medical groups with an internist
2,215
Cities
510

There are 18,948 internists in California. The Permanente Medical Group, Inc. has the most, 2,011, and Stanford Hospital at 300 Pasteur Drive has the most affiliated internists, 584. Los Angeles is home to 1,376, and 34% finished medical school 30 or more years ago.

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California internists, listed A to Z by last name (11,001 to 11,050 of 16,751)

Each internist on the list has internal medicine as their primary specialty and a California practice address. The list shows the NPI and city, and how many hospitals and medical groups each one practices with. A free account names every hospital and group, with validated contacts.

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California internists, A to Z, 11,001 to 11,050
InternistHospitalsMedical groupsEmail and phone
Daniel F. O'Neill, MDSan Francisco · NPI 15880079261 hospital2 groupsContacts
Jacqueline Jennifer O'Neill, MDOrange · NPI 15881538861 hospital2 groupsContacts
Timothy J. O'Neill, MDSan Diego · NPI 18311722951 hospital3 groupsContacts
Iwan Sing-Djwan Ong, MDRiverside · NPI 12654167391 hospital1 groupContacts
Melchor L. Ong, MDFresno · NPI 12453180701 hospital1 groupContacts
Michael K. Ong, MDLos Angeles · NPI 15987857761 hospital1 groupContacts
Roger L. Ong, MDLong Beach · NPI 1881761799-1 groupContacts
Stephen Gene Ong, MDSanta Clara · NPI 17807500182 hospitals1 groupContacts
Timothy Patrick Ong, MDSan Jose · NPI 10331250753 hospitals1 groupContacts
Van Tuyet Ong, DOSunnyvale · NPI 1285990614-1 groupContacts
Allen Onizuka, MDBaldwin Park · NPI 18112589401 hospital1 groupContacts
Ricky S. Onofre-Vasquez, MDInglewood · NPI 1750353892--Contacts
Pedro Ontiveros Jr Jr., MDLos Angeles · NPI 18514504491 hospital1 groupContacts
Ada C. Onyeagocha, MDHarbor City · NPI 19322709641 hospital1 groupContacts
Anne N. Onyekwuluje, MDWest Covina · NPI 16492104932 hospitals2 groupsContacts
Aung Naing Oo, MDModesto · NPI 12859836011 hospital1 groupContacts
Kay Thi Oo, MDRiverside · NPI 11841105381 hospital1 groupContacts
Khin Khin Oo, MDPasadena · NPI 1588638043--Contacts
Theingi Oo, MDLos Angeles · NPI 13666374072 hospitals-Contacts
Thiri T. Oo, MDFontana · NPI 16192566171 hospital2 groupsContacts
Tun Kyaw OoLancaster · NPI 1477973865-1 groupContacts
Kuo S. Ooi, MDRocklin · NPI 15987754213 hospitals1 groupContacts
Suma Oommen, MDIrvine · NPI 10634312031 hospital1 groupContacts
Michael Chinazo Opene, MDLos Angeles · NPI 18518274712 hospitals1 groupContacts
Alfred David Oppenheim, MDNovato · NPI 1023028917-1 groupContacts
Lucian Oprea, MDOntario · NPI 1033329792-4 groupsContacts
Roxana Orbegoso, MDRoseville · NPI 1255326138-1 groupContacts
Alexandra Orchard, MD, PhDSylmar · NPI 16499290761 hospital-Contacts
Tiffany M. Ordonez, MDHealdsburg · NPI 15887540064 hospitals3 groupsContacts
Maeve O'Regan, MDWalnut Creek · NPI 1871535203-2 groupsContacts
Serena Organ, DOLong Beach · NPI 1376278671--Contacts
Elmas Orhan, NPBakersfield · NPI 17500354321 hospital2 groupsContacts
Adrian Mark Oribello, MDRoseville · NPI 19121029221 hospital2 groupsContacts
Kevin W. Orita, MDFresno · NPI 10730761392 hospitals1 groupContacts
Thomas Maclay Ormiston, MDSan Jose · NPI 19827094401 hospital1 groupContacts
Jelyca OrmondSanta Clara · NPI 1396325916-1 groupContacts
Monica Page Ormsby, MDPoway · NPI 1639270366--Contacts
Joyce P. Orndorff, MDStockton · NPI 1730493693-1 groupContacts
Richard Angel OrnelasLos Gatos · NPI 17302582294 hospitals2 groupsContacts
Carlos Irwin OronceLos Angeles · NPI 16496252451 hospital1 groupContacts
Neema Oroomchi, MDLos Angeles · NPI 14476948721 hospital2 groupsContacts
Nadia Juanita Orosz, MDMountain View · NPI 13163673291 hospital1 groupContacts
Courtney E. O'Rourke, DOLa Jolla · NPI 1730118886-3 groupsContacts
Andrew Robert Orr, MDSan Francisco · NPI 1063807139--Contacts
Flint W. OrrSan Diego · NPI 16493668402 hospitals2 groupsContacts
Harold Orr Jr., MDNovato · NPI 18618228191 hospital1 groupContacts
J Margo Jaffe Orr, MDStockton · NPI 13968489411 hospital-Contacts
Margaret Ann Orr, MDFullerton · NPI 1184718793--Contacts
Norman K. Orr, DOMurrieta · NPI 18718595532 hospitals4 groupsContacts
Sharon E. Orrange, MDBeverly Hills · NPI 13169834061 hospital2 groupsContacts

The list shows the 16,751 internists with a public profile. The other 2,197 are counted in the total and searchable with a free account.

Sources: NPPES NPI Registry (CMS) and Dmand AI Affiliation Data

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