NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1265433700 M.D.
Verify on CMS → Earl Book, M.D.
Family Medicine Physician in Helena, Montana.
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
494
Medicare Part D claims · 283 beneficiaries · Family Medicine Physician avg: 3K
Generic prescribing
92%
generic claims · 5% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
81.4/100
▼ 2 pts below national avg 83.1 · Above neutral
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
Earl Book, M.D. reported a CMS MIPS final score of 81.4/100 - below the 83.1 national average - and filed 494 Medicare Part D claims in 2023.
- 81.4/100
- MIPS score · -2 vs avg
- 494
- Part D claims, 2023
- 92%
- 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.
Earl Book, M.D.'s MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
81 36th percentile higher than 36% of 477,587 scored providers
Each bar is a band; taller bars hold more scored 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.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Earl Book, M.D. sits
This provider among family medicine physician peers
Across the 22,040 family medicine physician providers who report both Medicare Part D prescribing and a MIPS quality score, Earl Book, M.D. writes more Part D claims than 24% of them and scores higher on MIPS quality than 35% - placing this provider in the lower-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one family medicine physician peer from a representative sample of 60; the gold marker is Earl Book, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Earl Book, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - 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 Earl Book, M.D.?
Near national averagePrimary specialty
Family Medicine Physician
Medicare Part D claims
494 86% vs specialty avg
MIPS final score
81.4/100 1.7 pts vs avg
Specialty distribution in Montana
How Family Medicine Physician compares to other specialties among Montana providers
Medicare quality performance, MIPS
Earl Book, M.D.'s 2023 MIPS final score plotted against the Family Medicine Physician national average
- MIPS Final Score
- 81.4/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Family Medicine Physician) - 81.4/100 vs national avg 83.1
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).
Earl Book, M.D. appears in the CMS NPPES registry as a Family Medicine Physician provider holding M.D. credentials at 3330 PTARMIGAN LN, Helena, MT, 59602, with a listed phone of (406) 457-4180. NPI 1265433700 was issued on 08/09/2005.
Medicare Part D records for calendar year 2023 show 494 prescription claims written by this provider, covering 283 Medicare beneficiaries and totaling roughly $9K in drug spend, split 5% brand-name and 92% generic by claim count, with an opioid prescribing rate of 3.0%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 81.4/100 for the 2023 performance year (Quality 73.2, Cost 64.9), compared with the national average of 83.1.
Family Medicine Physician is a high-volume specialty nationwide, with 147,760 enrolled providers across 56 states and an average of 3,418 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 | 1265433700 |
|---|---|
| Specialty | Family Medicine Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 08/09/2005 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
81.435
Final Score
Avg: 83.1
73.2294
Quality
64.8872
Cost
100
Promoting Interoperability
Reporting: Group practice
Brand vs generic prescribing mix · Generic-heavy
Earl Book, M.D. - brand share 5.0%
Family Medicine Physician average
5% brand-name claims vs 92% generic, on 494 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.
494
Total Claims
$9K
Total Drug Cost
283
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 503
- Total Day Supply
- 5,574
- Brand vs Generic
- 5% brand / 92% generic
- Brand Drug Cost
- $3K
- Generic Drug Cost
- $6K
- Opioid Claims
- 15 (3.0% rate)
- Antibiotic Claims
- 219
Patient Demographics
- Average Patient Age
- 74.4 years
- Avg HCC Risk Score
- 0.96
- Gender Split
- 59% female / 41% male
- Age Distribution
- <65: 17, 65-74: 137, 75-84: 93, 85+: 36
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Earl Book, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Prednisone
Prednisone
80 claims
- Doxycycline Monohy…
Doxycycline Monohydrate
46 claims
- Cefdinir
Cefdinir
35 claims
- Cefuroxime
Cefuroxime
34 claims
- Doxycycline Hyclate
Doxycycline Hyclate
33 claims
- Amoxicillin-Clavul… 20
Amoxicillin-Clavulanate Potass
20 claims
- Albuterol Sulfate … 18
Albuterol Sulfate Hfa
18 claims
- Azithromycin 17
Azithromycin
17 claims
| Drug | Claims |
|---|---|
| Prednisone | 80 |
| Doxycycline Monohydrate | 46 |
| Cefdinir | 35 |
| Cefuroxime Cefuroxime Axetil | 34 |
| Doxycycline Hyclate | 33 |
| Amoxicillin-Clavulanate Potass Amoxicillin/Potassium Clav | 20 |
| Albuterol Sulfate Hfa Albuterol Sulfate | 18 |
| Azithromycin | 17 |
| Omeprazole | 12 |
| Sulfamethoxazole-Trimethoprim Sulfamethoxazole/Trimethoprim | 11 |
* 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 Earl Book, M.D. 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
Earl Book, M.D.'s 494 claims are below the specialty average of 3,418.
Nearby Family Medicine Physician Providers in Montana
Other clinicians with the same primary specialty enrolled in Montana, drawn from the same CMS NPPES roster as Book.
Dr. Marc Adams
MD
Shelby, MT
Dr. Dale Agner
M.D.
Billings, MT
Dr. Cynthia Alarcon
PA-C
Helena, MT
Dr. Brandon Allen
MD
Ennis, MT
Dr. Hans Amen
D.O.
Malmstrom Afb, MT
Compare Family 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 Montana medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Family 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 Earl Book, M.D.'s specialty? ▼
Earl Book, M.D. specializes in Family Medicine Physician and practices in Helena, Montana. Credentials: M.D..
How much does Earl Book, M.D. prescribe under Medicare Part D? ▼
In 2023, Earl Book, M.D. wrote 494 Medicare Part D claims totaling $9K in drug costs for 283 beneficiaries.
What is Earl Book, M.D.'s Medicare quality score? ▼
Earl Book, M.D. has a CMS MIPS Final Score of 81.4/100 (Quality: 73.2, Cost: 64.9). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Earl Book, M.D. located? ▼
Earl Book, M.D. is located at 3330 PTARMIGAN LN, Helena, MT, 59602. Phone: (406) 457-4180.
What is Earl Book, M.D.'s NPI number? ▼
Earl Book, M.D.'s National Provider Identifier (NPI) is 1265433700, issued on 08/09/2005.
Does Earl Book, M.D. prescribe more brand-name or generic drugs? ▼
Earl Book, M.D.'s prescribing is 5% brand-name and 92% generic drugs by claim count, with $3K in brand drug costs.
Does Earl Book, M.D. prescribe opioids? ▼
Yes, Earl Book, M.D. had 15 opioid claims in 2023 with an opioid prescribing rate of 3.0%.
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 Earl Book, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Earl Book, M.D.'s most frequently prescribed drugs include Prednisone, Doxycycline Monohydrate, Cefdinir. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Earl Book, M.D. accept Medicare? ▼
Earl Book, M.D. appears in CMS Medicare data with 494 Part D claims and 283 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Earl Book, M.D.'s credentials? ▼
Earl Book, M.D.'s NPI is 1265433700 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.
- 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
Compiled from official public sources by the PlainDoctor editorial team.