NPI registry status
Active
2026 NPPES data Specialist NPI 1184738825 M.D.
Verify on CMS → Gregory Jackson, M.D.
Specialist in San Antonio, Texas.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 69,608 in Specialist, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
4K
Medicare Part D claims · 245 beneficiaries · Specialist avg: 1K
Generic prescribing
87%
generic claims · 11% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Gregory Jackson, M.D. filed 3,736 Medicare Part D claims in 2023 as a Specialist in San Antonio, Texas, prescribing 87% generic.
- 4K
- Part D claims, 2023
- 87%
- generic prescribing
- ≥91st
- pct by Part D claim volume (lower-bound band)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
CMS NPPES provider registry desk
NPI 1184738825 · Specialist
NPI-10 · ENUM-LEGACY · TAX-MEGA · RX-MID · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1184738825
- ENUM-LEGACY 2006
- TAX-MEGA 70K Specialist
- RX-MID 3,736
- BOOK-LIGHT 2,421 in Texas
- PHOTO-ENUM Andrea Curtis-Gibson · 2006
Gregory Jackson, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
3,736 ≥ 91st percentile 91% of 1,370,886 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
What does the federal data show about Gregory Jackson, M.D.?
Quality data not reportedPrimary specialty
Specialist
Medicare Part D claims
3,736 153% vs specialty avg
Specialty distribution in Texas
How Specialist compares to other specialties among Texas providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Specialist. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1184738825 |
|---|---|
| Specialty | Specialist |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 08/19/2006 |
License & disciplinary context - Texas TMB 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~77K Texas medical licensees in 2023 - they are NOT specific to Gregory Jackson, M.D.. To verify Gregory Jackson, M.D.'s current license status, search the TMB public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
344
Total board actions, Texas 2023
Across 334 cases
4.47
Actions per 1,000 licensees
Texas statewide rate
probation
Most common action type
94 cases
TMB publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Texas disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
Gregory Jackson, M.D. - brand share 11.0%
Specialist average
11% brand-name claims vs 87% generic, on 3,736 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
3,736
Total Claims
$391K
Total Drug Cost
245
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 7,228
- Total Day Supply
- 200,766
- Brand vs Generic
- 11% brand / 87% generic
- Brand Drug Cost
- $307K
- Generic Drug Cost
- $78K
- Opioid Claims
- 50 (1.3% rate)
- Antibiotic Claims
- 387
Patient Demographics
- Average Patient Age
- 74.8 years
- Avg HCC Risk Score
- 0.83
- Gender Split
- 49% female / 51% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Gregory Jackson, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Rosuvastatin Calcium
Rosuvastatin Calcium
289 claims
- Levothyroxine Sodium
Levothyroxine Sodium
205 claims
- Zolpidem Tartrate
Zolpidem Tartrate
135 claims
- Azithromycin
Azithromycin
120 claims
- Losartan Potassium 112
Losartan Potassium
112 claims
- Alprazolam 88
Alprazolam
88 claims
- Tamsulosin Hcl 88
Tamsulosin Hcl
88 claims
- Sertraline Hcl 86
Sertraline Hcl
86 claims
| Drug | Claims |
|---|---|
| Rosuvastatin Calcium | 289 |
| Levothyroxine Sodium | 205 |
| Zolpidem Tartrate | 135 |
| Azithromycin | 120 |
| Losartan Potassium | 112 |
| Alprazolam | 88 |
| Tamsulosin Hcl | 88 |
| Sertraline Hcl | 86 |
| Hydrochlorothiazide | 70 |
| Atorvastatin Calcium | 67 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Specialist Overview
How Gregory Jackson, M.D. fits within the Specialist landscape nationally.
69,608
Specialist Providers in US
55
States with Specialist
1,474
Avg Claims per Provider
Gregory Jackson, M.D.'s 3,736 claims are above the specialty average of 1,474.
Nationwide Specialist peers with similar MIPS or enrollment year
Two federal-record peer sets for Jackson, both outside Texas so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Specialist Providers in Texas
Other clinicians with the same primary specialty enrolled in Texas, drawn from the same CMS NPPES roster as Jackson.
One of 2,421 Specialist providers enrolled in Texas, 5 are shown here.
Beverly Abbott
Longview, TX
Dr. Magdy Abdelsayed
M.D.
Baytown, TX
Dr. Robin Abels
OTR
Carrollton, TX
Dr. Amr Abouleish
M.D.
Galveston, TX
Dr. Paul Abrell
ATC, L
El Paso, TX
Compare Specialist nationally: see state-by-state distribution →
Frequently Asked Questions
What is Gregory Jackson, M.D.'s specialty? ▼
Gregory Jackson, M.D. specializes in Specialist and practices in San Antonio, Texas. Credentials: M.D..
How much does Gregory Jackson, M.D. prescribe under Medicare Part D? ▼
In 2023, Gregory Jackson, M.D. wrote 3,736 Medicare Part D claims totaling $391K in drug costs for 245 beneficiaries.
Where is Gregory Jackson, M.D. located? ▼
Gregory Jackson, M.D. is located at 4220 MCCULLOUGH AVE, San Antonio, TX, 78212. Phone: (210) 829-0700.
What is Gregory Jackson, M.D.'s NPI number? ▼
Gregory Jackson, M.D.'s National Provider Identifier (NPI) is 1184738825, issued on 08/19/2006.
Does Gregory Jackson, M.D. prescribe more brand-name or generic drugs? ▼
Gregory Jackson, M.D.'s prescribing is 11% brand-name and 87% generic drugs by claim count, with $307K in brand drug costs.
Does Gregory Jackson, M.D. prescribe opioids? ▼
Yes, Gregory Jackson, M.D. had 50 opioid claims in 2023 with an opioid prescribing rate of 1.3%.
How many Specialist providers are there in the US? ▼
There are 69,608 Specialist providers across 55 states in the US. The average Specialist provider writes 1,474 Medicare Part D claims per year.
What drugs does Gregory Jackson, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Gregory Jackson, M.D.'s most frequently prescribed drugs include Rosuvastatin Calcium, Levothyroxine Sodium, Zolpidem Tartrate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Gregory Jackson, M.D. accept Medicare? ▼
Gregory Jackson, M.D. appears in CMS Medicare data with 3,736 Part D claims and 245 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Gregory Jackson, M.D.'s credentials? ▼
Gregory Jackson, M.D.'s NPI is 1184738825 with credentials M.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.