RESPONSIVE ID SOLUTIONS
NPI 1255357653
Internal Medicine - Infectious Disease in San Antonio, TX
About Responsive Id Solutions NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
RESPONSIVE ID SOLUTIONS (NPI 1255357653) is a healthcare organization registered as an infectious disease in San Antonio, Texas and active in the NPI registry since July 2006. The organization lists Robert A Zajac, President, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Other Identifiers 2
Group Practice 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, revalidation and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Responsive Id Solutions is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Revalidation Due Date
Revalidation due by February 28, 2027
Medicare-enrolled providers and suppliers confirm their enrollment information with CMS on a set cycle, every 5 years for most and every 3 years for medical equipment suppliers. CMS sets the due date for each enrollment.
Clinicians Billing Medicare Through This Organization
6Medicare enrollment records show 6 clinicians reassign Medicare billing to Responsive Id Solutions, which bills Medicare for the services they deliver. Of these, 4 practice within 10 miles. They are listed nearest first.
Clinicians, nearest first (6)
San Antonio, TX 78258
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
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 Robert A Zajac MD PA's NPI number?
The NPI number for Robert A Zajac MD PA is 1255357653. It was assigned to this organization in the NPPES registry on July 15, 2006. The provider is doing business as Responsive Id Solutions.
Where is Robert A Zajac MD PA located?
Robert A Zajac MD PA is located at 150 E Sonterra Blvd Suite 170, San Antonio, TX 78258. The listed phone number is (210) 481-2800.
What is Robert A Zajac MD PA's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.
Is Robert A Zajac MD PA enrolled in Medicare?
Yes. Robert A Zajac MD PA is registered in the Medicare PECOS enrollment system.
When is Robert A Zajac MD PA's Medicare revalidation due?
According to the CMS Revalidation Due Date List (October 2026 release), the Medicare Non-DME Part B enrollment for this organization (Texas, Clinic/Group Practice) is due for revalidation by February 28, 2027. Medicare providers and suppliers revalidate their enrollment every 5 years, and medical equipment suppliers every 3 years. Confirm current requirements with your Medicare Administrative Contractor.
How many clinicians bill Medicare through Robert A Zajac MD PA?
According to the CMS Revalidation Reassignment List (October 2026 release), 6 clinicians in 2 Medicare specialties reassign their Medicare billing to Robert A Zajac MD PA. A 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 the clinician's services. The largest specialties are Nurse Practitioner (5) and Infectious Disease (1). Of these, 4 practice within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
What insurance does Robert A Zajac MD PA accept?
Health plans from Blue Cross and Blue Shield of Texas and WellPoint list Robert A Zajac MD PA 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.
When was this NPI record last updated?
The NPPES record for Robert A Zajac MD PA was last updated on September 15, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 years 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.
# Responsive Id Solutions · NPI 1255357653
Infectious Disease organization in San Antonio, Texas. Organization record, active in the CMS NPPES registry since July 15, 2006.
## Identity
- **NPI:** 1255357653 (Entity type: Organization)
- **Enumerated:** July 15, 2006
- **Primary specialty:** Internal Medicine - Infectious Disease · taxonomy 207RI0200X
- **Legal business name:** Robert A Zajac Md Pa
- **Organization subpart:** No
- **Authorized official:** Robert Zajac, PRESIDENT
## Practice location
- **Address:** 150 E SONTERRA BLVD, SUITE 170, San Antonio, TX 78258-4098
- **Phone:** (210) 481-2800 · **Fax:** (210) 481-2834
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Medicare revalidation due:** February 28, 2027 (Non-DME Part B, Texas, Clinic/Group Practice) · CMS Revalidation Due Date List, October 2026 release
- **Clinicians billing through this organization:** 6 clinicians in 2 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Nurse Practitioner (5), Infectious Disease (1); 4 practice within 10 miles · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** September 15, 2015
- **Other identifiers:** Medicaid 183550601 (TX); Medicare PIN 00W932 (TX)
---
Source: [NPI Profile](https://npiprofile.com/npi/1255357653) · Data from the CMS NPPES public registry.