Individual provider Active NPI

Sydney Messlein, PA-C

  • Physician Assistant
  • Galveston, TX
National Provider Identifier
1215507447
Registry record updated Mar 2, 2023
On this page

Key facts

NPPES NPI Registry
Primary specialty
Physician AssistantTaxonomy code 363A00000X
Practice address
815 Market St
Galveston, TX 77550-2725
Phone
(409) 770-6515
NPI assigned
Jun 29, 2021
Last updated
Mar 2, 2023By the provider in NPPES
Sex
Female
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Mar 2, 2023

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Physician Assistant 363A00000X NU Primary

Addresses

Primary practice location

815 Market St
Galveston, TX 77550-2725

Mailing address

815 Market St
Galveston, TX 77550-2725

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in TX
Eligible to order & refer
  • Part B services: Yes
  • Medical equipment: Yes
  • Home health: Yes
  • Power mobility devices: Yes
  • Hospice: No
Green means eligible to order or refer.

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20210812000944 TX Practitioner - Physician Assistant 6800290834 Reassigns benefits to 2 organizations

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Physician Assistant

Practice roles

OrganizationSpecialtyStatusNew patients
Doctx3 PLLC CurrentSince Jul 28, 2021 Accepting new patients
Doctx3 PLLC CurrentSince Jul 28, 2021 Accepting new patients
Shriners Hospitals for Children CurrentSince Dec 21, 2025 Accepting new patients
Shriners Hospitals for Children CurrentSince Dec 21, 2025 Accepting new patients
Shriners Hospitals for Children Past Accepting new patients

Locations

5040 Addison Cir
Ste 400
Addison, TX 75001
Phone (214) 983-0300

3110 Guadalupe St
Ste 100
Austin, TX 78705
Phone (512) 599-9510

709 E Slaughter Ln
Ste 404
Austin, TX 78744
Phone (512) 277-6643

9500 Dallas Pkwy
Ste 100
Frisco, TX 75033
Phone (469) 535-6647

815 Market St
Galveston, TX 77550
Phone (409) 770-6600

3014 N O Connor Rd
Ste 200
Irving, TX 75062
Phone (214) 444-5558

2419 W Southlake Blvd
Ste 100
Southlake, TX 76092
Phone (469) 535-6842

Organizations & group practices 5

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

NPI Registry JSON

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1624924800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1677715200000",
    "number": "1215507447",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "815 MARKET ST",
            "city": "GALVESTON",
            "state": "TX",
            "postal_code": "775502725"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "815 MARKET ST",
            "city": "GALVESTON",
            "state": "TX",
            "postal_code": "775502725",
            "telephone_number": "409-770-6515"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MESSLEIN",
        "first_name": "SYDNEY",
        "credential": "PA-C",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2021-06-29",
        "last_updated": "2023-03-02",
        "certification_date": "2023-03-02",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "NU",
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Galveston, TX

Sources for this page

Verify at the official NPI Registry.