NPI registry status
Active
2026 NPPES data Infectious Disease Physician NPI 1245239177 MD
Verify on CMS → Alan Chapman, MD
Infectious Disease Physician in Houston, 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 8,537 in Infectious Disease 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 · 348 beneficiaries · Infectious Disease Physician avg: 807
Generic prescribing
88%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$50.41
2 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Alan Chapman, MD filed 1,999 Medicare Part D claims in 2024 as an Infectious Disease Physician in Houston, Texas, prescribing 88% generic.
- 2K
- Part D claims, 2024
- 88%
- generic prescribing
- $50.41
- industry payments (Sunshine Act)
- ≥83rd
- 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.
Federal trust snapshot
What official records show about Alan Chapman, MD
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1245239177), first enumerated 07/21/2005.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 1,999 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Practices in an ABMS-board-eligible specialty; board certification not confirmed in federal records.
- Reported
Industry payment transparency
$50.41 in reported industry payments (2 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- State context
State board disciplinary context
Texas statewide board action statistics are published annually — these figures describe aggregate state activity, not Alan Chapman, MD's individual license status. Verify directly with the state medical board.
Source: TMB annual report 2023
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1245239177 · Infectious Disease Physician
NPI-10 · ENUM-LEGACY · TAX-MID · RX-MID · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1245239177
- ENUM-LEGACY 2005
- TAX-MID 9K Infectious Disease
- RX-MID 1,999
- BOOK-LIGHT 544 in Texas
- PHOTO-ENUM David Liebers · 2005
Alan Chapman, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
1,999 ≥ 83rd percentile 83% of 1,416,883 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 · 2024
◑
Board-eligible specialty (heuristic, not verified)
Alan Chapman, 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 Alan Chapman, MD?
Quality data not reportedPrimary specialty
Infectious Disease Physician
Medicare Part D claims
1,999 148% vs specialty avg
Specialty distribution in Texas
How Infectious Disease 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 Infectious Disease 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 | 1245239177 |
|---|---|
| Specialty | Infectious Disease Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 07/21/2005 |
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 Alan Chapman, MD. Source: openpaymentsdata.cms.gov.
Total received
$50
Largest payer
Boston Scientific Corporation
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 Alan Chapman, MD. To verify Alan Chapman, 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
Alan Chapman, MD - brand share 12.0%
Infectious Disease Physician average
12% brand-name claims vs 88% generic, on 1,999 2024 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 2024.
1,999
Total Claims
$1.8M
Total Drug Cost
348
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 2,059.533
- Total Day Supply
- 28,309
- Brand vs Generic
- 12% brand / 88% generic
- Brand Drug Cost
- $740K
- Generic Drug Cost
- $1.1M
- Antibiotic Claims
- 1,675
Patient Demographics
- Average Patient Age
- 72.8 years
- Avg HCC Risk Score
- 3.25
- Gender Split
- 48% female / 52% male
- Age Distribution
- <65: 61, 65-74: 134, 75-84: 96, 85+: 57
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Alan Chapman, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Daptomycin
Daptomycin
429 claims
- Ertapenem
Ertapenem
378 claims
- Cefdinir
Cefdinir
175 claims
- Doxycycline Hyclate 100
Doxycycline Hyclate
100 claims
- Meropenem 97
Meropenem
97 claims
- Sulfamethoxazole-T… 90
Sulfamethoxazole-Trimethoprim
90 claims
- Biktarvy 85
Biktarvy
85 claims
- Cefepime Hcl 70
Cefepime Hcl
70 claims
| Drug | Claims |
|---|---|
| Daptomycin | 429 |
| Ertapenem Ertapenem Sodium | 378 |
| Cefdinir | 175 |
| Doxycycline Hyclate | 100 |
| Meropenem | 97 |
| Sulfamethoxazole-Trimethoprim Sulfamethoxazole/Trimethoprim | 90 |
| Biktarvy Bictegrav/Emtricit/Tenofov Ala | 85 |
| Cefepime Hcl | 70 |
| Ceftriaxone Ceftriaxone Sodium | 55 |
| Amoxicillin-Clavulanate Potass Amoxicillin/Potassium Clav | 54 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Infectious Disease Physician Overview
How Alan Chapman, MD fits within the Infectious Disease Physician landscape nationally.
8,537
Infectious Disease Physician Providers in US
54
States with Infectious Disease Physician
807
Avg Claims per Provider
Alan Chapman, MD's 1,999 claims are above the specialty average of 807.
Nationwide Infectious Disease Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Chapman, both outside Texas so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2005)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Infectious Disease Physician Providers in Texas
Other clinicians with the same primary specialty enrolled in Texas, drawn from the same CMS NPPES roster as Chapman.
One of 544 Infectious Disease Physician providers enrolled in Texas, 5 are shown here.
Dr. Jordan Abel
M.D.
San Antonio, TX
Dr. Oladapo Abodunde
M.D.
McKinney, TX
Dr. Leny Abraham
MD
Dallas, TX
Dr. Ahmed Abubaker
MD
Dallas, TX
Dr. Ashish Acharya
M.D.
Grapevine, TX
Compare Infectious Disease Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Alan Chapman, MD's specialty? ▼
Alan Chapman, MD specializes in Infectious Disease Physician and practices in Houston, Texas. Credentials: MD.
How much does Alan Chapman, MD prescribe under Medicare Part D? ▼
In 2024, Alan Chapman, MD wrote 1,999 Medicare Part D claims totaling $1.8M in drug costs for 348 beneficiaries.
Where is Alan Chapman, MD located? ▼
Alan Chapman, MD is located at 9055 KATY FWY, Houston, TX, 77024. Phone: (713) 467-1365.
What is Alan Chapman, MD's NPI number? ▼
Alan Chapman, MD's National Provider Identifier (NPI) is 1245239177, issued on 07/21/2005.
Does Alan Chapman, MD prescribe more brand-name or generic drugs? ▼
Alan Chapman, MD's prescribing is 12% brand-name and 88% generic drugs by claim count, with $740K in brand drug costs.
How many Infectious Disease Physician providers are there in the US? ▼
There are 8,537 Infectious Disease Physician providers across 54 states in the US. The average Infectious Disease Physician provider writes 807 Medicare Part D claims per year.
What drugs does Alan Chapman, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Alan Chapman, MD's most frequently prescribed drugs include Daptomycin, Ertapenem, Cefdinir. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Alan Chapman, MD accept Medicare? ▼
Alan Chapman, MD appears in CMS Medicare data with 1,999 Part D claims and 348 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Alan Chapman, MD's credentials? ▼
Alan Chapman, MD's NPI is 1245239177 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 (2024). 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 August 2026 (NPPES) / 2024 (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 August 2026.