Mac Ward Chamberlin, MD
Emergency Medicine Physician · Oakland, CA
Mac Ward Chamberlin, MD is an emergency medicine physician with a practice address in Oakland, California, and NPI 1881085439, issued on Feb 17, 2015. Check the license (California A159057, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mac Ward Chamberlin
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A159057 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1411 E 31St St, Oakland, CA 94602
- Phone
- (585) 473-2200
- Enumerated
- Feb 17, 2015
- Record last updated
- Jan 30, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20230828003612); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 1411 E 31St St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mac Ward Chamberlin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A159057Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Southeastern Emergency Physicians LLCRussellville, AR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mac Ward Chamberlin among 7,751 emergency medicine physician records in California
Mac Ward Chamberlin, MD is one of 7,751 emergency medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 72% of them.
- NPI issued2015 · 72% of these records are older, 25% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2017 · median 2011 among the 4,560 with a school on file
- Record last updated2020 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
247 emergency medicine physician records list a practice address in Oakland
They are 247 of the 18,558 NPPES records with a practice address in Oakland, and 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Oakland → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- David English, MDOakland, CA 946021275514325
- Bradley Frazee, MDOakland, CA 946021447241765
- Jocelyn Freeman, MDOakland, CA 946021194716498
- Jared Greenholz, MDOakland, CA 946021417930520
- Cherie Hargis, MDOakland, CA 946021821079377
- Abraha Kidane, PAOakland, CA 946021942291265
- Stephen Miller, MDOakland, CA 946021750363727
- Andrew Nothmann, MDOakland, CA 946021518949585
Common questions
What is Mac Ward Chamberlin, MD's NPI number?
Mac Ward Chamberlin, MD's National Provider Identifier (NPI) is 1881085439, issued on Feb 17, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Mac Ward Chamberlin, MD located?
The NPPES record lists a practice address at 1411 E 31St St, Oakland, CA, 94602. Phone: (585) 473-2200. Providers update this record themselves, so call before visiting.
How can I verify Mac Ward Chamberlin, MD's license?
NPPES lists California license number A159057, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.