Katrina Louise John, M.B.B.CH.
Emergency Medicine Physician · San Diego, CA
Katrina Louise John, M.B.B.CH. is an emergency medicine physician with a practice address in San Diego, California, and NPI 1255569786, issued on Jun 23, 2009. Check the license (California A127303, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Katrina Louise John
- Credential
- M.B.B.CH.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A127303 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3434 Midway Dr Ste 1002, San Diego, CA 92110
- Phone
- (619) 225-6200
- Enumerated
- Jun 23, 2009
- Record last updated
- Feb 26, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20131015002207); 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 3434 Midway Dr Ste 1002
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mark Tamsen, MDEmergency Medicine Physician1346241452
Verify Katrina Louise John in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A127303Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
33% fewer Medicare Part D claims than the average emergency medicine physician in 2024
151 Medicare Part D claims for 99 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 11 claims were for opioids.
Most prescribed
- Cefuroxime14 claims
- Amoxicillin-Clavulanate Potass11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Emergency Care Dynamics IncSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katrina Louise John among 7,751 emergency medicine physician records in California
Katrina Louise John, M.B.B.CH. 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 2009, is newer than 54% of them.
- NPI issued2009 · 54% of these records are older, 42% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2004 · median 2011 among the 4,560 with a school on file
- Record last updated2021 · 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).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in San Diego → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Timothy Cannis, M.D.San Diego, CA 921101659373652
- Robert Curran, M.D.San Diego, CA 921101063414753
- Richard Prince, M.D.San Diego, CA 921101740282672
- Mark Tamsen, MDSan Diego, CA 921101346241452
- Kevin Cabrera, DOSan Diego, CA 921111396464301
- Olga DiazSan Diego, CA 921111598128217
- Samer MetriSan Diego, CA 921111568116325
- Patrick Sheedy, MDSan Diego, CA 921111568164861
Common questions
What is Katrina Louise John, M.B.B.CH.'s NPI number?
Katrina Louise John, M.B.B.CH.'s National Provider Identifier (NPI) is 1255569786, issued on Jun 23, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Katrina Louise John, M.B.B.CH. located?
The NPPES record lists a practice address at 3434 Midway Dr Ste 1002, San Diego, CA, 92110. Phone: (619) 225-6200. Providers update this record themselves, so call before visiting.
How can I verify Katrina Louise John, M.B.B.CH.'s license?
NPPES lists California license number A127303, 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.
How much does Katrina Louise John, M.B.B.CH. prescribe under Medicare Part D?
In 2024, Katrina Louise John, M.B.B.CH. had 151 Medicare Part D claims for 99 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
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.