NPI registry status
Active
2026 NPPES data Sleep Medicine (Internal Medicine) Physician NPI 1013006063 M.D.
Verify on CMS → Nancy Esper, M.D.
Sleep Medicine (Internal Medicine) Physician in Bellaire, 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 859 in Sleep Medicine (Internal 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
2K
Medicare Part D claims · 141 beneficiaries · Sleep Medicine (Internal Medicine) Physician avg: 1K
Generic prescribing
83%
generic claims · 16% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$1.6K
63 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Nancy Esper, M.D. filed 2,029 Medicare Part D claims in 2023 as a Sleep Medicine (Internal Medicine) Physician in Bellaire, Texas, prescribing 83% generic.
- 2K
- Part D claims, 2023
- 83%
- generic prescribing
- $1.6K
- industry payments (Sunshine Act)
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.
Nancy Esper, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
2,029 Top 16% higher than 84% of 1,370,886 prescribers
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.
Source CMS Medicare Part D Prescriber Public Use File · 2023
◑
Board-eligible specialty (heuristic, not verified)
Nancy Esper, M.D. 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 Nancy Esper, M.D.?
Quality data not reportedPrimary specialty
Sleep Medicine (Internal Medicine) Physician
Medicare Part D claims
2,029 55% vs specialty avg
Specialty distribution in Texas
How Sleep Medicine (Internal 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 Sleep Medicine (Internal 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).
Nancy Esper, M.D. appears in the CMS NPPES registry as a Sleep Medicine (Internal Medicine) Physician provider holding M.D. credentials at 5959 WEST LOOP S STE 510, Bellaire, TX, 77401, with a listed phone of (713) 429-4097. NPI 1013006063 was issued on 10/11/2006.
Medicare Part D records for calendar year 2023 show 2,029 prescription claims written by this provider, covering 141 Medicare beneficiaries and totaling roughly $274K in drug spend, split 16% brand-name and 83% generic by claim count, with an opioid prescribing rate of 1.4%.
Sleep Medicine (Internal Medicine) Physician is a narrow specialty nationwide, with 859 enrolled providers across 52 states and an average of 1,310 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1013006063 |
|---|---|
| Specialty | Sleep Medicine (Internal Medicine) Physician |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 10/11/2006 |
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 Nancy Esper, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$1.6K
Largest payer
Amgen Inc.
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 Nancy Esper, M.D.. To verify Nancy Esper, 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
Nancy Esper, M.D. - brand share 16.0%
Sleep Medicine (Internal Medicine) Physician average
16% brand-name claims vs 83% generic, on 2,029 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.
2,029
Total Claims
$274K
Total Drug Cost
141
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 4,498
- Total Day Supply
- 128,132
- Brand vs Generic
- 16% brand / 83% generic
- Brand Drug Cost
- $230K
- Generic Drug Cost
- $44K
- Opioid Claims
- 28 (1.4% rate)
- Antibiotic Claims
- 90
Patient Demographics
- Average Patient Age
- 73.8 years
- Avg HCC Risk Score
- 0.98
- Gender Split
- 80% female / 20% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Nancy Esper, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
100 claims
- Rosuvastatin Calcium
Rosuvastatin Calcium
100 claims
- Levothyroxine Sodium
Levothyroxine Sodium
83 claims
- Metoprolol Succinate
Metoprolol Succinate
68 claims
- Amlodipine Besylate
Amlodipine Besylate
58 claims
- Hydrochlorothiazide
Hydrochlorothiazide
58 claims
- Olmesartan Medoxomil
Olmesartan Medoxomil
57 claims
- Lisinopril
Lisinopril
51 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 100 |
| Rosuvastatin Calcium | 100 |
| Levothyroxine Sodium | 83 |
| Metoprolol Succinate | 68 |
| Amlodipine Besylate | 58 |
| Hydrochlorothiazide | 58 |
| Olmesartan Medoxomil | 57 |
| Lisinopril | 51 |
| Ozempic Semaglutide | 45 |
| Synthroid Levothyroxine Sodium | 42 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Sleep Medicine (Internal Medicine) Physician in TX →
All providers in Texas →
Compare specialties →
Sleep Medicine (Internal Medicine) Physician Overview
How Nancy Esper, M.D. fits within the Sleep Medicine (Internal Medicine) Physician landscape nationally.
859
Sleep Medicine (Internal Medicine) Physician Providers in US
52
States with Sleep Medicine (Internal Medicine) Physician
1,310
Avg Claims per Provider
Nancy Esper, M.D.'s 2,029 claims are above the specialty average of 1,310.
Nearby Sleep Medicine (Internal Medicine) Physician Providers in Texas
Other clinicians with the same primary specialty enrolled in Texas, drawn from the same CMS NPPES roster as Esper.
Dr. Sanjay Aggarwal
MD
Lake Jackson, TX
Dr. Sergio Alvarez
M.D.
El Paso, TX
Dr. Sarah Andry
DO
San Antonio, TX
Dr. Strahil Atanasov
M.D.
Houston, TX
Dr. Joseph Austin
MD
Arlington, TX
Compare Sleep Medicine (Internal Medicine) Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Texas medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Sleep Medicine (Internal Medicine) Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Nancy Esper, M.D.'s specialty? ▼
Nancy Esper, M.D. specializes in Sleep Medicine (Internal Medicine) Physician and practices in Bellaire, Texas. Credentials: M.D..
How much does Nancy Esper, M.D. prescribe under Medicare Part D? ▼
In 2023, Nancy Esper, M.D. wrote 2,029 Medicare Part D claims totaling $274K in drug costs for 141 beneficiaries.
Where is Nancy Esper, M.D. located? ▼
Nancy Esper, M.D. is located at 5959 WEST LOOP S STE 510, Bellaire, TX, 77401. Phone: (713) 429-4097.
What is Nancy Esper, M.D.'s NPI number? ▼
Nancy Esper, M.D.'s National Provider Identifier (NPI) is 1013006063, issued on 10/11/2006.
Does Nancy Esper, M.D. prescribe more brand-name or generic drugs? ▼
Nancy Esper, M.D.'s prescribing is 16% brand-name and 83% generic drugs by claim count, with $230K in brand drug costs.
Does Nancy Esper, M.D. prescribe opioids? ▼
Yes, Nancy Esper, M.D. had 28 opioid claims in 2023 with an opioid prescribing rate of 1.4%.
How many Sleep Medicine (Internal Medicine) Physician providers are there in the US? ▼
There are 859 Sleep Medicine (Internal Medicine) Physician providers across 52 states in the US. The average Sleep Medicine (Internal Medicine) Physician provider writes 1,310 Medicare Part D claims per year.
What drugs does Nancy Esper, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Nancy Esper, M.D.'s most frequently prescribed drugs include Atorvastatin Calcium, Rosuvastatin Calcium, Levothyroxine Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Nancy Esper, M.D. accept Medicare? ▼
Nancy Esper, M.D. appears in CMS Medicare data with 2,029 Part D claims and 141 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Nancy Esper, M.D.'s credentials? ▼
Nancy Esper, M.D.'s NPI is 1013006063 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
Compiled from official public sources by the PlainDoctor editorial team.
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.