NPI Atlas

Mrs. Allison Mahlstedt Callender, PA-C

Physician Assistant in Houston, Texas. NPI 1063640845.

NPI1063640845

Registry record

NPI
1063640845
Profession
Physician Assistant (PA)
Specialty
Physician Assistant (363A00000X)
Practice address
6621 Fannin St, 19345-C
Houston, TX 77030
Phone
8328265600
In the registry since
June 30, 2009
Last NPPES update
October 28, 2015
Sole proprietor
No
License
PA07495 (TX)

At this location

193 other providers in our data list 6621 Fannin St, Houston as a practice address:

In context

The NPI number of Allison Callender is 1063640845. They are a Physician Assistant in Houston, Texas.

Allison Callender is one of 1,891 Physician Assistants in Houston and one of 11,405 across Texas in our data. Houston ranks #1 among Texas cities in our dataset, with 8,326 NP and PA providers.

The NPI has been in the federal registry for 17 years, since June 30, 2009.

Frequently asked questions

What is NPI 1063640845?

NPI 1063640845 is the 10-digit National Provider Identifier assigned to Allison Callender, a Physician Assistant practicing in Houston, Texas. The record has been in the NPPES registry since June 30, 2009.

How do I verify this provider?

Cross-check NPI 1063640845 in the official CMS registry at npiregistry.cms.hhs.gov, and confirm license PA07495 with the TX licensing board. You can also run the number through our free NPI validator to confirm its checksum.

Is this information current?

This profile reflects the June 2026 NPPES data file. NPPES lists the record's last update as October 28, 2015. We refresh our data each month when CMS publishes a new file.

Data: NPPES public registry, June 2026 file. Not medical advice. Verify independently before care or credentialing decisions. Errors in the source record can be corrected at nppes.cms.hhs.gov; see our corrections page.