NPI registry status
Active
2026 NPPES data Allergy & Immunology (Internal Medicine) Physician NPI 1578583191 MD
Verify on CMS → William Davidson, MD
Allergy & Immunology (Internal Medicine) Physician in Daphne, Alabama.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 517 in Allergy & Immunology (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
952
Medicare Part D claims · 197 beneficiaries · Allergy & Immunology (Internal Medicine) Physician avg: 798
Generic prescribing
53%
generic claims · 45% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
69.5/100
▼ 14 pts below national avg 83.5 · Mid-tier
Industry payments
$4.8K
129 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
William Davidson, MD reported a CMS MIPS final score of 69.5/100 - below the 83.5 national average - and filed 952 Medicare Part D claims in 2023.
- 69.5/100
- MIPS score · -14 vs avg
- 952
- Part D claims, 2023
- 53%
- 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.
Federal trust snapshot
What official records show about William Davidson, MD
Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1578583191), first enumerated 07/19/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 952 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
Reported a CMS MIPS final score of 69.5/100 in the Quality Payment Program — a federal quality measure, not a patient review.
Source: CMS Quality Payment Program
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Reported
Industry payment transparency
$4.8K in reported industry payments (129 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- 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 1578583191 · Allergy & Immunology (Internal Medicine) Physician
NPI-10 · ENUM-LEGACY · TAX-NARROW · MIPS-LOW · RX-LIGHT · BOOK-THIN · PHOTO-FINISH
- NPI-10 1578583191
- ENUM-LEGACY 2006
- TAX-NARROW 517
- MIPS-LOW 69.5/100
- RX-LIGHT 952
- BOOK-THIN 2 in Alabama
- PHOTO-FINISH Matthew Elliott · ±0.3
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Davidson · this …
Davidson · this provider
69.5 MIPS pts
- Matthew Elliott …
Matthew Elliott
69.8 MIPS pts
- Gailen Marshall …
Gailen Marshall
69.8 MIPS pts
- Sunil Saraf · near
Sunil Saraf
69.8 MIPS pts
- Susan Andrew · h…
Susan Andrew
70.6 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
William Davidson, MD's MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
70 ≥ 8th percentile 8% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured providers. 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 whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where William Davidson, MD sits
This provider among allergy & immunology (internal medicine) physician peers
Across the 127 allergy & immunology (internal medicine) physician providers who report both Medicare Part D prescribing and a MIPS quality score, William Davidson, MD writes more Part D claims than 77% of them and scores higher on MIPS quality than 6% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one allergy & immunology (internal medicine) physician peer from a representative sample of 60; the gold marker is William Davidson, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
William Davidson, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 1 hospital affiliation - 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 William Davidson, MD?
Below national averagePrimary specialty
Allergy & Immunology (Internal Medicine) Physician
Medicare Part D claims
952 19% vs specialty avg
MIPS final score
69.5/100 14 pts vs avg
Specialty distribution in Alabama
How Allergy & Immunology (Internal Medicine) Physician compares to other specialties among Alabama providers
Medicare quality performance, MIPS
William Davidson, MD's 2023 MIPS final score plotted against the Allergy & Immunology (Internal Medicine) Physician national average
- MIPS Final Score
- 69.5/100
- vs 83.5 national avg · 2023 performance year
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 | 1578583191 |
|---|---|
| Specialty | Allergy & Immunology (Internal Medicine) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 07/19/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
69.5263
Final Score
Measured-score avg: 83.5
67.602
Quality
50.1042
Cost
Reporting: Group practice
Hospital and facility affiliations
Facilities where William Davidson, 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.
Pulmonary Associates OF Mobile PC
Mobile, AL
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
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 William Davidson, MD. Source: openpaymentsdata.cms.gov.
Total received
$4.8K
Largest payer
GlaxoSmithKline, 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.
Brand vs generic prescribing mix · Above average
William Davidson, MD - brand share 45.0%
Allergy & Immunology (Internal Medicine) Physician average
45% brand-name claims vs 53% generic, on 952 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.
952
Total Claims
$1.6M
Total Drug Cost
197
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,233
- Total Day Supply
- 33,149
- Brand vs Generic
- 45% brand / 53% generic
- Brand Drug Cost
- $1.6M
- Generic Drug Cost
- $22K
- Antibiotic Claims
- 38
Patient Demographics
- Average Patient Age
- 71.0 years
- Avg HCC Risk Score
- 1.17
- Gender Split
- 70% female / 30% male
- Age Distribution
- <65: 20, 65-74: 115, 75-84: 51, 85+: 11
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What William Davidson, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Albuterol Sulfate …
Albuterol Sulfate Hfa
81 claims
- Montelukast Sodium
Montelukast Sodium
66 claims
- Famotidine
Famotidine
60 claims
- Trelegy Ellipta
Trelegy Ellipta
56 claims
- Prednisone
Prednisone
55 claims
- Dupixent Syringe
Dupixent Syringe
50 claims
- Levocetirizine Dih…
Levocetirizine Dihydrochloride
43 claims
- Breztri Aerosphere
Breztri Aerosphere
36 claims
| Drug | Claims |
|---|---|
| Albuterol Sulfate Hfa Albuterol Sulfate | 81 |
| Montelukast Sodium | 66 |
| Famotidine | 60 |
| Trelegy Ellipta Fluticasone/Umeclidin/Vilanter | 56 |
| Prednisone | 55 |
| Dupixent Syringe Dupilumab | 50 |
| Levocetirizine Dihydrochloride | 43 |
| Breztri Aerosphere Budesonide/Glycopyr/Formoterol | 36 |
| Dupixent Pen Dupilumab | 36 |
| Wixela Inhub Fluticasone Propion/Salmeterol | 29 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Allergy & Immunology (Internal Medicine) Physician in AL →
All providers in Alabama →
Compare specialties →
Allergy & Immunology (Internal Medicine) Physician Overview
How William Davidson, MD fits within the Allergy & Immunology (Internal Medicine) Physician landscape nationally.
517
Allergy & Immunology (Internal Medicine) Physician Providers in US
47
States with Allergy & Immunology (Internal Medicine) Physician
798
Avg Claims per Provider
William Davidson, MD's 952 claims are above the specialty average of 798.
Nationwide Allergy & Immunology (Internal Medicine) Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Davidson, both outside Alabama so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (69.5 here).
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Allergy & Immunology (Internal Medicine) Physician Providers in Alabama
Other clinicians with the same primary specialty enrolled in Alabama, drawn from the same CMS NPPES roster as Davidson.
Frequently Asked Questions
What is William Davidson, MD's specialty? ▼
William Davidson, MD specializes in Allergy & Immunology (Internal Medicine) Physician and practices in Daphne, Alabama. Credentials: MD.
How much does William Davidson, MD prescribe under Medicare Part D? ▼
In 2023, William Davidson, MD wrote 952 Medicare Part D claims totaling $1.6M in drug costs for 197 beneficiaries.
What is William Davidson, MD's Medicare quality score? ▼
William Davidson, MD has a CMS MIPS Final Score of 69.5/100 (Quality: 67.6, Cost: 50.1). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is William Davidson, MD located? ▼
William Davidson, MD is located at 8725 COUNTY ROAD 64, Daphne, AL, 36526. Phone: (251) 625-1370.
What is William Davidson, MD's NPI number? ▼
William Davidson, MD's National Provider Identifier (NPI) is 1578583191, issued on 07/19/2006.
Does William Davidson, MD prescribe more brand-name or generic drugs? ▼
William Davidson, MD's prescribing is 45% brand-name and 53% generic drugs by claim count, with $1.6M in brand drug costs.
How many Allergy & Immunology (Internal Medicine) Physician providers are there in the US? ▼
There are 517 Allergy & Immunology (Internal Medicine) Physician providers across 47 states in the US. The average Allergy & Immunology (Internal Medicine) Physician provider writes 798 Medicare Part D claims per year.
What drugs does William Davidson, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, William Davidson, MD's most frequently prescribed drugs include Albuterol Sulfate Hfa, Montelukast Sodium, Famotidine. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does William Davidson, MD accept Medicare? ▼
William Davidson, MD appears in CMS Medicare data with 952 Part D claims and 197 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify William Davidson, MD's credentials? ▼
William Davidson, MD's NPI is 1578583191 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.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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.