NELSON R. KALAF, MD P.A.
NPI 1811028921
Internal Medicine in Mission, TX
About Nelson R. Kalaf, Md P.a. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
NELSON R. KALAF, MD P.A. (NPI 1811028921) is a healthcare organization registered as an internal medicine in Mission, Texas and active in the NPI registry since March 2007. The organization lists Isabel Kalaf, Office Manager, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Nelson R. Kalaf, Md P.a. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
Medicare enrollment records show 1 clinician reassigns Medicare billing to Nelson R. Kalaf, MD P.A., which bills Medicare for the services this clinician delivers.
Clinician (1)
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 Nelson R. Kalaf, MD P.A.'s NPI number?
The NPI number for Nelson R. Kalaf, MD P.A. is 1811028921. It was assigned to this organization in the NPPES registry on March 8, 2007.
Where is Nelson R. Kalaf, MD P.A. located?
Nelson R. Kalaf, MD P.A. is located at 2023 E Griffin Pkwy, Mission, TX 78572. The listed phone number is (956) 585-2525.
What is Nelson R. Kalaf, MD P.A.'s specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Nelson R. Kalaf, MD P.A. enrolled in Medicare?
Yes. Nelson R. Kalaf, MD P.A. is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Nelson R. Kalaf, MD P.A.?
According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Internal Medicine) reassigns their Medicare billing to Nelson R. Kalaf, MD P.A.. 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. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
When was this NPI record last updated?
The NPPES record for Nelson R. Kalaf, MD P.A. was last updated on February 5, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Nelson R. Kalaf, Md P.a. · NPI 1811028921
Internal Medicine organization in Mission, Texas. Organization record, active in the CMS NPPES registry since March 8, 2007.
## Identity
- **NPI:** 1811028921 (Entity type: Organization)
- **Enumerated:** March 8, 2007
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **Organization subpart:** No
- **Authorized official:** Isabel Kalaf, OFFICE MANAGER
## Practice location
- **Address:** 2023 E GRIFFIN PKWY, Mission, TX 78572-3222
- **Phone:** (956) 585-2525
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 1 clinician (Internal Medicine) reassigns Medicare billing to this organization (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** February 5, 2024
- **Other identifiers:** Medicaid 170490001 (TX)
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Source: [NPI Profile](https://npiprofile.com/npi/1811028921) · Data from the CMS NPPES public registry.