Updated October 2026

Emergency medicine physicians in Walnut Creek, CA

Emergency medicine
Walnut Creek, California

Emergency medicine physicians: 82
Linked to a hospital or group: 64
Hospitals with an emergency medicine physician: 31
Medical groups with an emergency medicine physician: 28
Practice at a hospital: 60

There are 82 emergency medicine physicians in Walnut Creek. Vituity has the most, 38, and John Muir Medical Center, Walnut Creek has the most affiliated emergency medicine physicians, 34. 18% finished medical school 30 or more years ago.

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Walnut Creek emergency medicine physicians, listed A to Z by last name

Each emergency medicine physician on the list has emergency medicine as their primary specialty and a Walnut Creek practice address. The list shows the NPI, 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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Walnut Creek emergency medicine physicians, A to Z
Emergency medicine physician	Hospitals	Medical groups	Email and phone
Eric AaserudeNPI 1811491194	2 hospitals	1 group	Contacts
Shayna Su-Yi Adams, MDNPI 1578060380	4 hospitals	2 groups	Contacts
Caron Renee Aghareza, MDNPI 1922283779	2 hospitals	2 groups	Contacts
Grace Gyungah Ahn, MDNPI 1194923813	2 hospitals	1 group	Contacts
Christopher M. Allen, MDNPI 1477812170	4 hospitals	4 groups	Contacts
Heba Al Rebh, MDNPI 1124414222	2 hospitals	5 groups	Contacts
Peter Harry Anastopoulos, MDNPI 1861792442	3 hospitals	2 groups	Contacts
Stephen Reed Beckwith, MDNPI 1134235260	3 hospitals	3 groups	Contacts
Peter Christopher Benson, MDNPI 1487680393	-	2 groups	Contacts
Shane Lewis BierlyNPI 1952980427	4 hospitals	2 groups	Contacts
William H. Birdsong IV, MDNPI 1447338512	1 hospital	1 group	Contacts
Kristin Blair Cochran, MDNPI 1700046976	1 hospital	1 group	Contacts
Craig Robinson Devinney, MDNPI 1730115353	2 hospitals	3 groups	Contacts
Michael J. Disano, MDNPI 1609963057	4 hospitals	2 groups	Contacts
Yalina Disla, MD, MPHNPI 1225458227	2 hospitals	1 group	Contacts
Timothy J. Drazek, MDNPI 1336155795	2 hospitals	2 groups	Contacts
Madeline Grade, MDNPI 1497215644	4 hospitals	3 groups	Contacts
Sean Sorosh Grammy, DONPI 1982832127	3 hospitals	3 groups	Contacts
David L. Griffith, MDNPI 1093914442	3 hospitals	2 groups	Contacts
Shao-I Huang, DONPI 1215031455	4 hospitals	2 groups	Contacts
Kimberly Marie IwakiNPI 1427476266	2 hospitals	1 group	Contacts
Todd A. Kessinger, MDNPI 1255374732	4 hospitals	3 groups	Contacts
Michael Kessler, MDNPI 1316995830	2 hospitals	3 groups	Contacts
Robert E. Koshlap, MDNPI 1598843658	-	-	Contacts
Conrad N. Lai, MDNPI 1942248141	-	1 group	Contacts
Brian A. Lentz, MD, MSNPI 1710421284	4 hospitals	2 groups	Contacts
Daniel R. Lewis, MDNPI 1770661829	-	-	Contacts
Edward John Lin, MD, MPHNPI 1629226337	1 hospital	1 group	Contacts
Alexander Lippert, MDNPI 1649358748	-	-	Contacts
Corey Michael Long, MDNPI 1841480159	4 hospitals	3 groups	Contacts
Lisa H. Low, DONPI 1275611378	1 hospital	1 group	Contacts
Michael R. Lozano, MDNPI 1114005287	-	-	Contacts
Margaret MahaffaNPI 1215557426	3 hospitals	1 group	Contacts
Erica Siovhan Marshburn, MDNPI 1629521315	-	2 groups	Contacts
Hector A. Martinez, MDNPI 1902835424	-	1 group	Contacts
Bruce Allyn Marts, DONPI 1679651707	1 hospital	1 group	Contacts
Todd Andrew McGregor, MDNPI 1427106400	1 hospital	4 groups	Contacts
William M. Mills, MDNPI 1497779300	4 hospitals	3 groups	Contacts
Maisie Sophia Mok, DONPI 1528269875	2 hospitals	1 group	Contacts
Swathi Nadindla, MDNPI 1659534295	5 hospitals	3 groups	Contacts
Andrew B. Napier, MDNPI 1285175430	2 hospitals	6 groups	Contacts
Jackie Tuyet Nhi Thi Nguyen, MDNPI 1710627047	2 hospitals	2 groups	Contacts
Karl Joshua NimtzNPI 1417535600	2 hospitals	1 group	Contacts
Marianna Lucia Oppenheimer, MD, MSNPI 1538657762	2 hospitals	1 group	Contacts
Andrew Masaaki Osugi, MDNPI 1134307382	5 hospitals	3 groups	Contacts
Jeanne S. PaeNPI 1831222009	4 hospitals	3 groups	Contacts
Michael Stephen Page, MDNPI 1578927208	1 hospital	2 groups	Contacts
Matthew Sproul Paparian, DONPI 1528623634	6 hospitals	3 groups	Contacts
Chi Lee Perlroth, MDNPI 1912111873	3 hospitals	3 groups	Contacts
Derek Kuhl Richardson, MDNPI 1871750851	6 hospitals	6 groups	Contacts

Showing 1 to 50 of 69 Walnut Creek emergency medicine physicians

The list shows the 69 emergency medicine physicians with a public profile. The other 13 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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Dmand AI has the EHR for 80 of 82 Walnut Creek emergency medicine physicians, at their hospital and their practice. Filter by Epic, Oracle Health, MEDITECH, athenahealth and more, then reach them with validated work emails and mobile numbers.

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Vituity has the most emergency medicine physicians in Walnut Creek, with 38

The Permanente Medical Group, Inc. is second with 30, and CEP America third with 27. Counts are emergency medicine physicians with a California address linked to each group.

Medical groups with the most emergency medicine physicians in Walnut Creek
#	Medical group	Parent organization	Emergency medicine physicians
1	VituityModesto	Parent on file	38
2	The Permanente Medical Group, Inc.Pleasanton	Parent on file	30
3	CEP AmericaEmeryville	Parent on file	27
4	VituityEmeryville	Parent on file	10
5	Solano Gateway Medical Group, Inc.Fairfield	-	5
6	John Muir HealthWalnut Creek	Parent on file	2
7	NES HealthPorterville	Parent on file	2
8	Inspire Health Medical GroupFresno	-	2
9	John Muir Medical GroupWalnut Creek	Parent on file	2
10	Inspire Health Medical GroupFresno	-	2

Top 10 of 28 Walnut Creek medical groups with an emergency medicine physician

Sources: Dmand AI Affiliation Data and Dmand AI Org Hierarchy Data

John Muir Medical Center, Walnut Creek has the most affiliated emergency medicine physicians in Walnut Creek, with 34

Walnut Creek Medical Center is second with 25, and Concord Medical Center third with 21. Walnut Creek emergency medicine physicians are affiliated with 31 hospitals in all.

Hospitals with the most emergency medicine physicians in Walnut Creek
#	Hospital	Health system	Emergency medicine physicians
1	John Muir Medical Center, Walnut CreekWalnut Creek	John Muir Health	34
2	Walnut Creek Medical CenterWalnut Creek	Kaiser Permanente	25
3	Concord Medical CenterConcord	John Muir Health	21
4	Antioch Medical CenterAntioch	Kaiser Permanente	13
5	Sutter Delta Medical CenterAntioch	Sutter Health	6
6	Community Regional Medical CenterFresno	Community Health System	3
7	Alta Bates Summit Medical Center \| Alta Bates CampusBerkeley	Sutter Health	3
8	Oakland Medical CenterOakland	Kaiser Permanente	2
9	Regional Medical CenterSan Jose	County of Santa Clara, CA	2
10	UCSF Health Hyde HospitalSan Francisco	University of California Health	2

Top 10 of 31 Walnut Creek hospitals with an affiliated emergency medicine physician

See every hospital and group for each Walnut Creek emergency medicine physician

Each public profile names one place an emergency medicine physician practices. A free account shows all of them, with the employer, the EHR and validated contacts.

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Source: Dmand AI Affiliation Data

Most Walnut Creek emergency medicine physicians practice at a hospital: 60 of the 62 with a mapped site

8 also practice at a medical group site. An emergency medicine physician can practice at several kinds of site, so the shares overlap.

Walnut Creek emergency medicine physicians by site of care

Hospitals6097%
Medical group practices813%

Sources: Dmand AI Affiliation Data and Dmand AI Practice Data

18% of Walnut Creek emergency medicine physicians finished medical school 30 or more years ago

11 of the 62 Walnut Creek emergency medicine physicians with a graduation year on file. 13 graduated in the last 10 years.

Physicians by years since medical school

Under 10 years ago1321%
10 to 19 years ago1727%
20 to 29 years ago2134%
30 to 39 years ago711%
40 or more years ago46%

Source: Dmand AI Professional Profile Data

Every Walnut Creek emergency medicine physician profile shows current hospitals and groups, Medicare activity and NPI details

Primary practiceThe main place they practice, with its type and cityOn every profile
Every site of careEach hospital, clinic and group where they practice nowWith a free account
EmployerThe organization they work for, when one is on fileWith a free account
Medicare servicesServices and procedure codes billed to Medicare, from CMSOn every profile
Medicare Part D prescribingClaims and drug costs from Part D, from CMSOn every profile
Industry paymentsPayments from drug and device makers, from CMS Open PaymentsOn every profile
Publications and clinical trialsResearch papers and trials linked to the NPI, when on fileOn every profile
Licenses and graduation yearState license numbers and medical school graduation yearOn every profile
NPI detailsNPI, enumeration date, primary taxonomy and practice addressOn every profile
Work email and mobile numberFound on request through healthcare waterfall enrichment, then validatedWith a free account
EHR in useThe EHR at each site where they practiceWith a free account
Colleagues at each siteThe clinicians they work with at each hospital and groupWith a free account

Free account: 30 days free, self-serve, no credit card.

Sources: NPPES NPI Registry (CMS), Medicare Physician & Other Practitioners (CMS), Open Payments (CMS) and Dmand AI Affiliation Data

Sources for the Walnut Creek emergency medicine physician directory

Sources for the data on this page
Data on this page	Source
HCPs, types and specialties	NPPES NPI Registry (CMS) and Dmand AI Professional Profile Data
Sites of care, hospitals and medical groups	Dmand AI Affiliation Data
Medical school graduation year	Dmand AI Professional Profile Data

Data last refreshed October 2026Report an inaccuracy Remove my information

Emergency medicine physicians are HCPs whose primary specialty is emergency medicine (taxonomy code 207P00000X), with an active NPI and a Walnut Creek practice address.

FAQ

Frequently asked questions about emergency medicine physicians in Walnut Creek

Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.

How many emergency medicine physicians are in Walnut Creek?

82 emergency medicine physicians have an active NPI, a Walnut Creek practice address and emergency medicine (taxonomy code 207P00000X) as their primary specialty. 64 of them are linked to a hospital or medical group.

Which Walnut Creek medical groups have the most emergency medicine physicians?

Vituity, with 38, followed by The Permanente Medical Group, Inc. with 30 and CEP America with 27.

Which Walnut Creek hospitals have the most emergency medicine physicians?

John Muir Medical Center, Walnut Creek, with 34 affiliated emergency medicine physicians, followed by Walnut Creek Medical Center with 25 and Concord Medical Center with 21.

What share of Walnut Creek emergency medicine physicians practice at a hospital?

60 of the 62 Walnut Creek emergency medicine physicians with a mapped site of care, or 97%, have a current hospital affiliation.

What is the taxonomy code for emergency medicine?

207P00000X is the NPPES taxonomy code for emergency medicine. Sub-specialties with their own code are counted on their own lists.

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