NPI registry status
Active
2026 NPPES data Sleep Medicine (Internal Medicine) Physician NPI 1043261399 MD
Verify on CMS → Allen Foster, MD
Sleep Medicine (Internal Medicine) Physician in La Crosse, Wisconsin.
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
324
Medicare Part D claims · 75 beneficiaries · Sleep Medicine (Internal Medicine) Physician avg: 1K
Generic prescribing
97%
generic claims · 3% brand-name · higher generic rates reduce patient out-of-pocket costs
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
Allen Foster, MD filed 324 Medicare Part D claims in 2023 as a Sleep Medicine (Internal Medicine) Physician in La Crosse, Wisconsin, prescribing 97% generic.
- 324
- Part D claims, 2023
- 97%
- generic prescribing
- Likely
- board-certified (heuristic)
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.
Allen Foster, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
324 Top 43% higher than 57% 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 certification likely (heuristic, not verified)
Allen Foster, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 3 hospital affiliations - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Allen Foster, MD?
Quality data not reportedPrimary specialty
Sleep Medicine (Internal Medicine) Physician
Medicare Part D claims
324 75% vs specialty avg
Specialty distribution in Wisconsin
How Sleep Medicine (Internal Medicine) Physician compares to other specialties among Wisconsin 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).
Allen Foster, MD appears in the CMS NPPES registry as a Sleep Medicine (Internal Medicine) Physician provider holding MD credentials at 1836 SOUTH AVE, La Crosse, WI, 54601, with a listed phone of (608) 782-7300. NPI 1043261399 was issued on 05/12/2006.
Medicare Part D records for calendar year 2023 show 324 prescription claims written by this provider, covering 75 Medicare beneficiaries and totaling roughly $9K in drug spend, split 3% brand-name and 97% generic by claim count.
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 | 1043261399 |
|---|---|
| Specialty | Sleep Medicine (Internal Medicine) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 05/12/2006 |
Hospital and facility affiliations
Facilities where Allen Foster, MD bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
According to CMS billing records, Allen Foster, MD is affiliated with 3 Medicare-billing facilities.
Gundersen Clinic Ltd
Tomah, WI
Gundersen Lutheran Medical Center Inc
La Crosse, WI
Saint Elizabeths Hospital OF Wabasha Inc
La Crosse, WI
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Brand vs generic prescribing mix · Generic-heavy
Allen Foster, MD - brand share 3.0%
Sleep Medicine (Internal Medicine) Physician average
3% brand-name claims vs 97% generic, on 324 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.
324
Total Claims
$9K
Total Drug Cost
75
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 702
- Total Day Supply
- 20,848
- Brand vs Generic
- 3% brand / 97% generic
- Brand Drug Cost
- $3K
- Generic Drug Cost
- $7K
Patient Demographics
- Average Patient Age
- 69.7 years
- Avg HCC Risk Score
- 1.12
- Gender Split
- 55% female / 45% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Allen Foster, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Gabapentin
Gabapentin
143 claims
- Pramipexole Dihydr… 40
Pramipexole Dihydrochloride
40 claims
- Ropinirole Hcl 29
Ropinirole Hcl
29 claims
- Clonazepam 23
Clonazepam
23 claims
- Armodafinil 22
Armodafinil
22 claims
- Montelukast Sodium 15
Montelukast Sodium
15 claims
- Modafinil 14
Modafinil
14 claims
| Drug | Claims |
|---|---|
| Gabapentin | 143 |
| Pramipexole Dihydrochloride Pramipexole Di-Hcl | 40 |
| Ropinirole Hcl | 29 |
| Clonazepam | 23 |
| Armodafinil | 22 |
| Montelukast Sodium | 15 |
| Modafinil | 14 |
* 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 WI →
All providers in Wisconsin →
Compare specialties →
Sleep Medicine (Internal Medicine) Physician Overview
How Allen Foster, MD 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
Allen Foster, MD's 324 claims are below the specialty average of 1,310.
Nearby Sleep Medicine (Internal Medicine) Physician Providers in Wisconsin
Other clinicians with the same primary specialty enrolled in Wisconsin, drawn from the same CMS NPPES roster as Foster.
Dr. Dima Adl
MD
Milwaukee, WI
Dr. Ewa Alexander
MD
Fitchburg, WI
Dr. Iftekhar Bader
M.D.
Racine, WI
Dr. Ryan Butcher
DO
Fond Du Lac, WI
Dr. Medhavani Chandra
MD
Madison, WI
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 Wisconsin 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.
Healthcare Guides
Learn more about finding, verifying, and understanding healthcare providers.
How to Find a Doctor
Step-by-step guide to choosing a provider
Verify Credentials
Check NPI, board certification & license status
Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore Wisconsin
Frequently Asked Questions
What is Allen Foster, MD's specialty? ▼
Allen Foster, MD specializes in Sleep Medicine (Internal Medicine) Physician and practices in La Crosse, Wisconsin. Credentials: MD.
How much does Allen Foster, MD prescribe under Medicare Part D? ▼
In 2023, Allen Foster, MD wrote 324 Medicare Part D claims totaling $9K in drug costs for 75 beneficiaries.
Where is Allen Foster, MD located? ▼
Allen Foster, MD is located at 1836 SOUTH AVE, La Crosse, WI, 54601. Phone: (608) 782-7300.
What is Allen Foster, MD's NPI number? ▼
Allen Foster, MD's National Provider Identifier (NPI) is 1043261399, issued on 05/12/2006.
Does Allen Foster, MD prescribe more brand-name or generic drugs? ▼
Allen Foster, MD's prescribing is 3% brand-name and 97% generic drugs by claim count, with $3K in brand drug costs.
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 Allen Foster, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Allen Foster, MD's most frequently prescribed drugs include Gabapentin, Pramipexole Dihydrochloride, Ropinirole Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Allen Foster, MD accept Medicare? ▼
Allen Foster, MD appears in CMS Medicare data with 324 Part D claims and 75 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Allen Foster, MD's credentials? ▼
Allen Foster, MD's NPI is 1043261399 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
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.