NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1528285079 MD
Verify on CMS → Don Callens, MD
Family Medicine Physician in Liberty, 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 147,760 in Family Medicine Physician, 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
18K
Medicare Part D claims · 994 beneficiaries · Family Medicine Physician avg: 3K
Generic prescribing
84%
generic claims · 15% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$42.07
2 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Don Callens, MD filed 18,455 Medicare Part D claims in 2023 as a Family Medicine Physician in Liberty, Texas, prescribing 84% generic.
- 18K
- Part D claims, 2023
- 84%
- generic prescribing
- $42.07
- industry payments (Sunshine Act)
- ≥98th
- 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 1528285079 · Family Medicine Physician
NPI-10 · ENUM-MID · TAX-MEGA · RX-HEAVY · BOOK-MID · PHOTO-ENUM
- NPI-10 1528285079
- ENUM-MID 2007
- TAX-MEGA 148K Family Medicine
- RX-HEAVY 18K claims
- BOOK-MID 10,448 in Texas
- PHOTO-ENUM Kristi Gibson Kusnier · 2007
Don Callens, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
18,455 ≥ 98th percentile 98% 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
◑
Board-eligible specialty (heuristic, not verified)
Don Callens, MD practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Don Callens, MD?
Quality data not reportedPrimary specialty
Family Medicine Physician
Medicare Part D claims
18,455 5× vs specialty avg
Specialty distribution in Texas
How Family Medicine Physician 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 Family Medicine Physician. 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 | 1528285079 |
|---|---|
| Specialty | Family Medicine Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 04/19/2007 |
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Don Callens, MD. Source: openpaymentsdata.cms.gov.
Total received
$42
Largest payer
Lilly USA, LLC
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
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 Don Callens, MD. To verify Don Callens, MD'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
Don Callens, MD - brand share 15.0%
Family Medicine Physician average
15% brand-name claims vs 84% generic, on 18,455 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.
18,455
Total Claims
$1.4M
Total Drug Cost
994
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 31,227
- Total Day Supply
- 863,595
- Brand vs Generic
- 15% brand / 84% generic
- Brand Drug Cost
- $1.1M
- Generic Drug Cost
- $293K
- Opioid Claims
- 574 (3.1% rate)
- Antibiotic Claims
- 709
Patient Demographics
- Average Patient Age
- 76.4 years
- Avg HCC Risk Score
- 1.48
- Gender Split
- 61% female / 39% male
- Age Distribution
- <65: 68, 65-74: 376, 75-84: 342, 85+: 208
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Don Callens, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
958 claims
- Levothyroxine Sodium
Levothyroxine Sodium
823 claims
- Lisinopril
Lisinopril
518 claims
- Gabapentin
Gabapentin
498 claims
- Amlodipine Besylate
Amlodipine Besylate
473 claims
- Pantoprazole Sodium
Pantoprazole Sodium
442 claims
- Sertraline Hcl 316
Sertraline Hcl
316 claims
- Furosemide 312
Furosemide
312 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 958 |
| Levothyroxine Sodium | 823 |
| Lisinopril | 518 |
| Gabapentin | 498 |
| Amlodipine Besylate | 473 |
| Pantoprazole Sodium | 442 |
| Sertraline Hcl | 316 |
| Furosemide | 312 |
| Hydrochlorothiazide | 308 |
| Potassium Chloride | 297 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Family Medicine Physician Overview
How Don Callens, MD fits within the Family Medicine Physician landscape nationally.
147,760
Family Medicine Physician Providers in US
56
States with Family Medicine Physician
3,418
Avg Claims per Provider
Don Callens, MD's 18,455 claims are above the specialty average of 3,418.
Nationwide Family Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Callens, both outside Texas so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2007)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Family Medicine Physician Providers in Texas
Other clinicians with the same primary specialty enrolled in Texas, drawn from the same CMS NPPES roster as Callens.
One of 10,448 Family Medicine Physician providers enrolled in Texas, 5 are shown here.
Dr. Srinivasa Aaluri
MD
El Paso, TX
Dr. Maira Aamir
MD
Shenandoah, TX
Dr. Fakhrudin Aaseemah Mohamed
M.D
Allen, TX
Dr. So Abad
MD
Wichita Falls, TX
Yoseph Abadi
Richardson, TX
Compare Family Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Don Callens, MD's specialty? ▼
Don Callens, MD specializes in Family Medicine Physician and practices in Liberty, Texas. Credentials: MD.
How much does Don Callens, MD prescribe under Medicare Part D? ▼
In 2023, Don Callens, MD wrote 18,455 Medicare Part D claims totaling $1.4M in drug costs for 994 beneficiaries.
Where is Don Callens, MD located? ▼
Don Callens, MD is located at 720 TRAVIS, Liberty, TX, 77575. Phone: (936) 336-6439.
What is Don Callens, MD's NPI number? ▼
Don Callens, MD's National Provider Identifier (NPI) is 1528285079, issued on 04/19/2007.
Does Don Callens, MD prescribe more brand-name or generic drugs? ▼
Don Callens, MD's prescribing is 15% brand-name and 84% generic drugs by claim count, with $1.1M in brand drug costs.
Does Don Callens, MD prescribe opioids? ▼
Yes, Don Callens, MD had 574 opioid claims in 2023 with an opioid prescribing rate of 3.1%.
How many Family Medicine Physician providers are there in the US? ▼
There are 147,760 Family Medicine Physician providers across 56 states in the US. The average Family Medicine Physician provider writes 3,418 Medicare Part D claims per year.
What drugs does Don Callens, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Don Callens, MD's most frequently prescribed drugs include Atorvastatin Calcium, Levothyroxine Sodium, Lisinopril. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Don Callens, MD accept Medicare? ▼
Don Callens, MD appears in CMS Medicare data with 18,455 Part D claims and 994 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Don Callens, MD's credentials? ▼
Don Callens, MD's NPI is 1528285079 with credentials MD. 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.