DR. CESAR ABRAHAM SANTILLANA MD
NPI 1063974889
Internal Medicine in Tucson, AZ
About Dr. Cesar Abraham Santillana Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. CESAR ABRAHAM SANTILLANA MD (NPI 1063974889) is an individual internal medicine provider in Tucson, Arizona, licensed in California (C-193242) and active in the NPI registry since April 2019. He is enrolled in Medicare PECOS, is affiliated with Baptist Health Hardin, and maintains 5 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 5
Accepted Insurance
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
Dr. Cesar Abraham Santillana Md 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
19Medicare enrollment records show Cesar Santillana reassigns Medicare billing to 19 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Tucson, AZ 85745
- Reassigned Medicare billing, Arizona enrollment
- 293 clinicians in this Medicare group
Phoenix, AZ 85016
- Reassigned Medicare billing, Arizona enrollment
- 240 clinicians in this Medicare group
Socorro, NM 87801
- Reassigned Medicare billing, New Mexico enrollment
- 2,331 clinicians in this Medicare group
Colton, CA 92324
- Reassigned Medicare billing, California enrollment
- 338 clinicians in this Medicare group
Gilroy, CA 95020
- Reassigned Medicare billing, California enrollment
- 2,460 clinicians in this Medicare group
Mountain View, CA 94040
- Reassigned Medicare billing, California enrollment
- 217 clinicians in this Medicare group
Humble, TX 77338
- Reassigned Medicare billing, New Mexico enrollment
- 251 clinicians in this Medicare group
West Memphis, AR 72301
- Reassigned Medicare billing, Virginia enrollment
- 528 clinicians in this Medicare group
Saint Louis, MO 63141
- Reassigned Medicare billing, Illinois enrollment
- 507 clinicians in this Medicare group
Paducah, KY 42003
- Reassigned Medicare billing, Kentucky enrollment
- 967 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.
Areas of Expertise CMS Part B claims 7
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Baptist Health Hardin
Acute Care Hospitals · Elizabethtown, KYMcleod Regional Medical Center-Pee Dee
Acute Care Hospitals · Florence, SCSt Francis Hospital
Acute Care Hospitals · Memphis, TNPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 85745 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
TUCSON, AZ 85745
TUCSON, AZ 85745
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 Cesar Santillana's NPI number?
The NPI number for Cesar Santillana is 1063974889. It was assigned to this individual provider in the NPPES registry on April 1, 2019.
Where is Cesar Santillana located?
Cesar Santillana practices at 1601 W Saint Marys Rd, Tucson, AZ 85745. The listed phone number is (520) 622-5833.
What is Cesar Santillana's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Cesar Santillana enrolled in Medicare?
Yes. Cesar Santillana 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 Cesar Santillana's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Cesar Santillana reassigns Medicare benefits to 19 organizations: Tucson Physician Group Holdings, LLC (Tucson, AZ), Apogee Medical Group Inc (Phoenix, AZ), Presbyterian Healthcare Services (Socorro, NM), Quantum Healthcare Medical Associates Inc. (Colton, CA), County Of Santa Clara (Gilroy, CA) and 14 more organizations, listed in the Medicare section above. 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 Cesar Santillana's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Cesar Santillana accept?
Health plans from Anthem Blue Cross and Blue Shield, Blue Cross Blue Shield of Arizona, Cigna HealthCare of Arizona, Inc, Imperial Insurance Companies, Inc. and Oscar Health and 2 other insurers list Cesar Santillana as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Cesar Santillana affiliated with any hospitals?
According to CMS data, Cesar Santillana is affiliated with Baptist Health Hardin, Mcleod Regional Medical Center-Pee Dee and St Francis Hospital.
When was this NPI record last updated?
The NPPES record for Cesar Santillana was last updated on August 14, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months 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.
# Dr. Cesar Abraham Santillana, MD · NPI 1063974889
Internal Medicine physician in Tucson, Arizona. Individual provider, active in the CMS NPPES registry since April 1, 2019.
## Identity
- **NPI:** 1063974889 (Entity type: Individual)
- **Enumerated:** April 1, 2019
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** C-193242 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1601 W SAINT MARYS RD, Tucson, AZ 85745-2623
- **Phone:** (520) 622-5833
## 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:** 19 organizations under Medicare reassignment (form CMS-855R): Tucson Physician Group Holdings, LLC (NPI 1356726939, Tucson, AZ); Apogee Medical Group Inc (NPI 1205883725, Phoenix, AZ); Presbyterian Healthcare Services (NPI 1336124205, Socorro, NM); Quantum Healthcare Medical Associates Inc. (NPI 1568490597, Colton, CA); County Of Santa Clara (NPI 1922093533, Gilroy, CA); and 14 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2018
## Record status
- **NPPES last updated:** August 14, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1063974889) · Data from the CMS NPPES public registry.