NELSON RAFAEL KALAF MD
NPI 1205858107
Internal Medicine in Mcallen, TX
About Nelson Rafael Kalaf Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
NELSON RAFAEL KALAF MD (NPI 1205858107) is an individual internal medicine provider in Mcallen, Texas, licensed in Texas (L 0307) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, is affiliated with Mission Regional Medical Center, and is a graduate of Other (1989).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 2
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
Nelson Rafael Kalaf 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
2Medicare enrollment records show Nelson Kalaf reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Mission, TX 78572
- Reassigned Medicare billing, Texas enrollment
Mission, TX 78572
- Reassigned Medicare billing, Texas enrollment
- Medicare enrollment name: Wellmed Medical Group PA
- 762 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 9
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.
Mission Regional Medical Center
Acute Care Hospitals · Mission, TXRio Grande Regional Hospital
Acute Care Hospitals · Mcallen, TXDoctors Hosptal At Renaissance
Acute Care Hospitals · Edinburg, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 78501 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims 11
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 4
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MCALLEN, TX 78501
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 Kalaf's NPI number?
The NPI number for Nelson Kalaf is 1205858107. It was assigned to this individual provider in the NPPES registry on July 23, 2006.
Where is Nelson Kalaf located?
Nelson Kalaf practices at 1417 N Ware Rd Ste 300, Mcallen, TX 78501. The listed phone number is (956) 585-4704.
What is Nelson Kalaf's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Nelson Kalaf enrolled in Medicare?
Yes. Nelson Kalaf 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 Nelson Kalaf's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nelson Kalaf reassigns Medicare benefits to 2 organizations: Nelson R. Kalaf, MD P.A. (Mission, TX) and Wellmed Medical Group, P.A. (Mission, TX). 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 Nelson Kalaf's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Nelson Kalaf accept?
Health plans from Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Superior HealthPlan and Ambetter of Oklahoma and 1 other insurer list Nelson Kalaf 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 Nelson Kalaf affiliated with any hospitals?
According to CMS data, Nelson Kalaf is affiliated with Mission Regional Medical Center, Rio Grande Regional Hospital and Doctors Hosptal At Renaissance.
When was this NPI record last updated?
The NPPES record for Nelson Kalaf was last updated on October 2, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 23 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.
# Nelson Rafael Kalaf, MD · NPI 1205858107
Internal Medicine physician in Mcallen, Texas. Individual provider, active in the CMS NPPES registry since July 23, 2006.
## Identity
- **NPI:** 1205858107 (Entity type: Individual)
- **Enumerated:** July 23, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** L 0307 (Texas)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1417 N WARE RD STE 300, Mcallen, TX 78501-8587
- **Phone:** (956) 585-4704 · **Fax:** (956) 585-6775
## 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): Nelson R. Kalaf, MD P.A. (NPI 1811028921, Mission, TX); Wellmed Medical Group, P.A. (NPI 1194023697, Mission, TX) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1989
## Record status
- **NPPES last updated:** October 2, 2026
- **Other identifiers:** Medicaid 092532305 (TX); Medicaid 092532303 (TX)
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Source: [NPI Profile](https://npiprofile.com/npi/1205858107) · Data from the CMS NPPES public registry.