Dr. Alden Paige Gregston , MD
Ophthalmology • Longview, TX
2394 H G Mosley Pkwy
Longview, TX 756043661
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
-
NPI assigned on March 27, 2019; this date does not establish years in practice.
-
Published CMS data list 27 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
-
Published Part D records, 2024:
- Prednisolone Acetate — 15 prescription fills, including refills.
- Neomycin-Polymyxin-Dexameth (Neomycin/Polymyxin B/Dexametha) — 12 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See the full table · Guide: How to read Medicare Part D prescriber data
-
Fewer Part D prescriptions than 95% of clinicians listed under Ophthalmology in Texas (2024, 1,063 clinicians with data). Median for this group: 915. Middle half: 323 to 2,164.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Billing and prescribing volume is not a quality rating.
-
Medicare Part D prescriptions went from 90 in 2020 to 27 in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2020–2024.
Practice Location & Contact Primary Location
2394 H G Mosley Pkwy
Longview, TX 756043661
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
NPPES lists 1 additional practice-address record in Tyler, TX. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
CMS Doctors and Clinicians lists 1 group name: Charles L. Heaton, M.D. P.A.. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
Texas A & M University System, Hsc, College Of Medicine
2019
What Public CMS Data Show
Ophthalmology: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
27 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$640 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024.
Open Payments general payments, program year 2025
All general payments: $135.28 across 6 records.
By nature of payment
- Food and Beverage: $135.28 across 6 records.
Reporting-company totals (3 largest of 6)
- Dompe US, Inc.: $31.88 across 1 record.
- Oyster Point Pharma, Inc.: $29.08 across 1 record.
- ABBVIE INC.: $21.41 across 1 record.
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 2025 (published June 30, 2026).
Years since graduation
7 years (graduated 2019)
CMS Doctors and Clinicians data list 2019 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2019
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.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
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; Medicare.gov, “Does your provider accept Medicare as full payment?”
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.
Enrolled in Medicare (PECOS)
Dr. Gregston 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 Dr. Gregston 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 Longview and Texas
Billing and prescribing volume is not a quality rating.
Medicare Part D prescriptions
Fewer Part D prescriptions than 95% of clinicians listed under Ophthalmology in Texas (2024, 1,063 clinicians with data). Median for this group: 915. Middle half: 323 to 2,164.
Too few clinicians listed under Ophthalmology in Longview have Medicare Part D data for 2024 to compare.
Part D drug cost
A lower Part D drug cost than 90% of clinicians listed under Ophthalmology in Texas (2024, 1,063 clinicians with data). Median for this group: $74,106. Middle half: $14,269 to $242,034.
Too few clinicians listed under Ophthalmology in Longview have Medicare Part D data for 2024 to compare.
9 active clinicians are listed under Ophthalmology with a practice address in Longview, TX (1,512 in Texas).
Addresses are self-reported to NPPES and may be out of date.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
-
Medicare Part D prescriptions
Medicare Part D prescriptions decreased 70% from 90 in 2020 to 27 in 2024.
- 2020: 90
- 2021: 270
- 2022: 117
- 2023: 205
- 2024: 27
-
30-day fills
30-day fills decreased 88% from 221 in 2020 to 27 in 2024.
- 2020: 221
- 2021: 518
- 2022: 211
- 2023: 290
- 2024: 27
-
Part D drug cost
Part D drug cost went from $918 in 2020 to $640 in 2024.
- 2020: $918
- 2021: $28,773
- 2022: $13,440
- 2023: $13,888
- 2024: $640
-
Industry payments (Open Payments)
Industry payments (Open Payments) went from $20.38 in 2024 to $135.28 in 2025.
- 2024: $20.38
- 2025: $135.28
Sources: CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · 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 2025 (payments made January 1 – December 31, 2025): fewer than 11 records totaling $135.28.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Dompe US, Inc. |
Food and Beverage
In-kind items and services
|
OXERVATE | General | $31.88 |
| Oyster Point Pharma, Inc. |
Food and Beverage
In-kind items and services
|
TYRVAYA | General | $29.08 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
|
LUMIGAN | General | $21.41 |
| RxSight Inc |
Food and Beverage
In-kind items and services
|
RXSIGHT CONTACT LENS | General | $18.78 |
| Bausch & Lomb Americas Inc. |
Food and Beverage
In-kind items and services
|
VYZULTA | General | $18.40 |
| Stryker Corporation |
Food and Beverage
In-kind items and services
|
1788 | General | $15.73 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Prednisolone Acetate | Prednisolone Acetate | 15 | 340 | $493.41 | 15 |
| Neomycin-Polymyxin-Dexameth | Neomycin/Polymyxin B/Dexametha | 12 | 215 | $146.36 | — |
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2026-08-26NUCC Taxonomy Code: 207W00000X
An ophthalmologist has the knowledge and professional skills needed to provide comprehensive eye and vision care. Ophthalmologists are medically trained to diagnose, monitor and medically or surgically treat all ocular and visual disorders. This includes problems affecting the eye and its component structures, the eyelids, the orbit and the visual pathways. In so doing, an ophthalmologist prescribes vision services, including glasses and contact lenses.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - OPHTHALMOLOGY
I20240719003431
TX
2466899968
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Charles L. Heaton, M.d. P.a.
2394 H G Mosley Pkwy, Longview, TX 756043661
Phone: 90352604442111
Secondary Practice Locations
3355 Earl Campbell Pkwy
Tyler, TX 757018435
Phone: 9035260444
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Optometrist
Doctor of Osteopathic Medicine (D.O.)
Ophthalmology
Doctor of Medicine (M.D.)
Optometrist
Doctor of Optometry
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Additional practice office at 3355 Earl Campbell Pkwy, Tyler, TX 757018435
Ophthalmology (license number reported to NPPES: TX V2089)
Registered at 3355 EARL CAMPBELL PKWY, TYLER, TX 757018435 (Tel: 9035260444)
Registered at 2394 H G MOSLEY PKWY, LONGVIEW, TX 756043661 (Tel: 9032340771)
Registered at 3415 GOLDEN RD, TYLER, TX 757018355 (Tel: 9035260444)
Recorded as ALDEN GREGSTON, MD
Ophthalmology (license number reported to NPPES: TX V2089)
NPI status registered as active in NPPES database
Registered at 3500 GASTON AVE, DALLAS, TX 752462088 (Tel: 2148206202)
Registered at 8515 GLENCREST LN, DALLAS, TX 752092631 (Tel: 9033994827)
Recorded as ALDEN GREGSTON
Student in an Organized Health Care Education/Training Program
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Ophthalmology Specialists in Longview
- Dr. Michael Guillory, MD
- Dr. Gana Nadiga, MD
- Dr. Sawyer Hall, DO
- Dr. Joel Muirhead, MD
- Dr. David Risner, MD
- Dr. Jonathan Walgama, MD
Mailing Address
3355 Earl Campbell Pkwy
Tyler, TX 757018435
Phone: 9035260444