Physician Profile
Unclaimed ProfileAbout HAMMES
John Stephen Hammes, M.D. practises nephrology in San Diego, CA. John is a 1993 graduate of Uniformed Services Uhs Fe Hebert School of Med.
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
Common questions
What is Dr. Hammes's specialty?
Dr. Hammes is a kidney specialist in San Diego, CA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “Nephrology”.
NPI registry
Where can I find Dr. Hammes?
Dr. Hammes is listed at 8885 RIO SAN DIEGO DR STE 212, San Diego, CA 92108. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Hammes?
The number on file is (619) 299-2350. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Hammes's NPI number?
Dr. Hammes's National Provider Identifier is 1891766994. 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. Hammes's medical education?
Dr. Hammes attended Uniformed Services Uhs Fe Hebert School of Med, graduating in 1993. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Hammes been practising?
Dr. Hammes has 33 years experience. Calculated from a graduation year of 1993, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Hammes known for?
According to Medicare billing data, Dr. Hammes provides treatments such as hemodialysis procedure with physician evaluation and dialysis services, 4 or more physician visits per month, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Hammes confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Hammes. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (619) 299-2350
- Email not available
Practice Locations
8885 RIO SAN DIEGO DR STE 212
San Diego, CA 92108
Procedures Most Often Billed to Medicare
2,257 services · 832 patients · 12 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Hemodialysis procedure with physician evaluation | Treatment | 90935 |
238 |
| Dialysis services, 4 or more physician visits per month (20 years or older) | Treatment | 90960 |
235 |
| Dialysis procedure including 1 evaluation | Treatment | 90945 |
110 |
| Home dialysis services per month (20 years or older) | Treatment | 90966 |
103 |
| Dialysis services, 2-3 physician visits per month (20 years or older) | Treatment | 90961 |
69 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
792 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
251 |
| Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient' | Billing code | G2211 |
223 |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | Office visit | 99223 |
155 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | Office visit | 99233 |
37 |
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 kidney specialists at this location 5
Same specialty, same street address — most likely the same department or group.
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.
Other kidney specialists in San Diego 6
Same specialty, same city.
More connections — 23 related providers in 3 groups
Trained at Uniformed Services Uhs Fe Hebert School of Med 7
Other providers in the same specialty who trained at the same institution.
Class of 1993 at Uniformed Services Uhs Fe Hebert School of Med 8
Providers who graduated from the same medical school in the same year.
Also performs Hemodialysis procedure with physician evaluation 8
Providers in CA who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.