Physician Profile
Unclaimed ProfileAbout JOHN
Katrina Louise John, M.B.B.CH. is a healthcare provider in San Diego, CA specializing in emergency medicine. According to Medicare claims data, Katrina cared for 150 Medicare patients across 151 services.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (619) 225-6200
- Email not available
Practice Locations
3434 MIDWAY DR STE 1002
San Diego, CA 92110
Procedures Most Often Billed to Medicare
151 services · 150 patients · 6 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | Treatment | 93010 |
18 |
| Emergency department visit with high level of medical decision making | Office visit | 99285 |
50 |
| Emergency department visit with moderate level of medical decision making | Office visit | 99284 |
36 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
22 |
| Critical care, first 30-74 minutes | Office visit | 99291 |
14 |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
11 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other emergency medicines at this location 4
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 1
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 32 related providers in 4 groups
Other emergency medicines in San Diego 8
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 2004 at Other 8
Providers who graduated from the same medical school in the same year.
Also performs Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 8
Providers in CA who bill this service to Medicare most often.
Common questions
What is Dr. John's specialty?
Dr. John is an emergency medicine in San Diego, CA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “EMERGENCY MEDICINE”.
NPI registry
Where can I find Dr. John?
Dr. John is listed at 3434 MIDWAY DR STE 1002, San Diego, CA 92110. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. John?
The number on file is (619) 225-6200. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. John's NPI number?
Dr. John's National Provider Identifier is 1255569786. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Dr. John's medical education?
Dr. John attended Other, graduating in 2004. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. John been practicing?
Dr. John has 22 years experience. Calculated from a graduation year of 2004, reported in the CMS National Downloadable File.
CMS public data
What is Dr. John known for?
According to Medicare billing data, Dr. John provides treatments such as routine electrocardiogram using at least 12 leads with interpretation and report only, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. John confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. John. If this is you, claiming it is free.
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Claim this profileProvider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.