Sydney Messlein , PA-C
Physician Assistant β’ Galveston, TX
815 Market St
Galveston, TX 775502725
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
Practice Location & Contact Primary Location
815 Market St
Galveston, TX 775502725
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Physician Assistant: NPPES taxonomy is a reported classification, not proof of board certification.
Open Payments general payments, program year 2022
All general payments: $70.13 across 2 records.
By nature of payment
- Food and Beverage: $70.13 across 2 records.
Reporting-company totals
- BioMarin Pharmaceutical Inc.: $70.13 across 2 records.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2022 (published June 30, 2026).
NPI first issued
2021
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians, CMS release of October 2, 2026; Medicare.gov, βDoes your provider accept Medicare as full payment?β
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians, CMS release of October 2, 2026.
Enrolled in Medicare (PECOS)
Sydney Messlein has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Sydney Messlein as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Galveston and Texas
65 active clinicians are listed under Physician Assistant with a practice address in Galveston, TX (11,139 in Texas).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Galveston
6.2% of these 65 clinicians have the CMS telehealth indicator.
46.2% of these 65 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
-
Industry payments (Open Payments)
CMS data for industry payments (Open Payments) are available for 2022 only.
Sources: CMS Open Payments (2022), CMS Doctors and Clinicians, CMS release of October 2, 2026, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo Β· Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2022 (payments made January 1 β December 31, 2022): fewer than 11 records totaling $70.13.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| BioMarin Pharmaceutical Inc. |
Food and Beverage
In-kind items and services
|
Vimizim | General | $56.25 |
| BioMarin Pharmaceutical Inc. |
Food and Beverage
In-kind items and services
|
β | General | $13.88 |
Source: CMS Open Payments, program year 2022, released June 30, 2026.
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2023-03-02NUCC Taxonomy Code: 363A00000X
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - PHYSICIAN ASSISTANT
I20210812000944
TX
6800290834
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Nurse Practitioner - Family
Family Nurse Practitioner
Surgery - Surgical Critical Care
Doctor of Medicine (M.D.)
Physician Assistant - Surgical
Physician Assistant (Certified)
Surgery - Surgical Critical Care
Doctor of Medicine (M.D.)
Physician Assistant - Surgical
Physician Assistant (Certified)
Surgery - Trauma Surgery
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 815 MARKET ST, GALVESTON, TX 775502725 (Tel: 4097706515)
Registered at 815 MARKET ST, GALVESTON, TX 775502725
Registered at 2419 W SOUTHLAKE BLVD STE 100, SOUTHLAKE, TX 760921506
Recorded as SYDNEY MESSLEIN, PA-C
NPI status registered as active in NPPES database
Registered at 2419 W SOUTHLAKE BLVD STE 100, SOUTHLAKE, TX 760921506 (Tel: 4695356842)
Registered at 13290 NOEL RD APT 104, DALLAS, TX 752405649 (Tel: 3098832307)
Recorded as SYDNEY ZETTERBERG, PA-C
Physician Assistant
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Physician Assistants in Galveston
- Taylor Guzman, PA-C
- Mary French, PA-C
- Jennifer Brown, PA-C
- Sally Ly, PA
- Katherine Banick, PA-C
- Andrew Goldstein, MPAS, PA-C
Mailing Address
815 Market St
Galveston, TX 775502725