PROF. THEODOROS FOTIOU KATSIVAS MD MAS AAHIVS
NPI 1679526164
Internal Medicine - Infectious Disease in San Diego, CA
About Prof. Theodoros Fotiou Katsivas Md Mas Aahivs NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
PROF. THEODOROS FOTIOU KATSIVAS MD MAS AAHIVS (NPI 1679526164) is an individual infectious disease provider in San Diego, California, licensed in California (A78543) and active in the NPI registry since May 2006. He is enrolled in Medicare PECOS and is a graduate of Other (1994).
NPPES Registry Identity
Specialties & Licenses 3
Other Names 1
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Prof. Theodoros Fotiou Katsivas Md Mas Aahivs is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Theodoros Katsivas reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Diego, CA 92103
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: Regents Of The University Of California
- 1,051 clinicians in this Medicare group
Fremont, CA 94538
- Reassigned Medicare billing, California enrollment
- 127 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 92103 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Theodoros Katsivas's NPI number?
The NPI number for Theodoros Katsivas is 1679526164. It was assigned to this individual provider in the NPPES registry on May 18, 2006. The provider is also known as Prof. Theodore Fotiou Katsivas MD.
Where is Theodoros Katsivas located?
Theodoros Katsivas practices at 405 W Robinson Ave, San Diego, CA 92103. The listed phone number is (619) 379-8664.
What is Theodoros Katsivas's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.
Is Theodoros Katsivas enrolled in Medicare?
Yes. Theodoros Katsivas is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Theodoros Katsivas's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Theodoros Katsivas reassigns Medicare benefits to 2 organizations: Regents Of The University Of California - Ucsd Medical Group (San Diego, CA) and Bay Area Community Health (Fremont, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Theodoros Katsivas's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Theodoros Katsivas was last updated on October 14, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Prof. Theodoros Fotiou Katsivas, MD MAS AAHIVS · NPI 1679526164
Infectious Disease physician in San Diego, California. Individual provider, active in the CMS NPPES registry since May 18, 2006.
## Identity
- **NPI:** 1679526164 (Entity type: Individual)
- **Enumerated:** May 18, 2006
- **Primary specialty:** Internal Medicine - Infectious Disease · taxonomy 207RI0200X
- **State license:** A78543 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 405 W ROBINSON AVE, San Diego, CA 92103-3942
- **Phone:** (619) 379-8664 · **Fax:** (619) 927-8756
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Regents Of The University Of California - Ucsd Medical Group (NPI 1336267137, San Diego, CA); Bay Area Community Health (NPI 1780054379, Fremont, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1994
## Record status
- **NPPES last updated:** October 14, 2026
- **Other identifiers:** Medicaid 00A785430 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1679526164) · Data from the CMS NPPES public registry.