NPI registry status
Active
2026 NPPES data Dermatology Physician NPI 1063456226 M.D.
Verify on CMS → Charles Hammer, M.D.
Dermatology Physician in Littleton, New Hampshire.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 14,645 in Dermatology 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
1K
Medicare Part D claims · 444 beneficiaries · Dermatology Physician avg: 729
Generic prescribing
73%
generic claims · 27% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
76/100
▼ 7 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
Charles Hammer, M.D. reported a CMS MIPS final score of 76/100 - below the 83.1 national average - and filed 1,360 Medicare Part D claims in 2023.
- 76/100
- MIPS score · -7 vs avg
- 1K
- Part D claims, 2023
- 73%
- 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.
Charles Hammer, 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
76 21st percentile higher than 21% 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 Charles Hammer, M.D. sits
This provider among dermatology physician peers
Across the 6,594 dermatology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Charles Hammer, M.D. writes more Part D claims than 83% of them and scores higher on MIPS quality than 30% - placing this provider in the high-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 dermatology physician peer from a representative sample of 60; the gold marker is Charles Hammer, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Charles Hammer, M.D. 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 Charles Hammer, M.D.?
Below national averagePrimary specialty
Dermatology Physician
Medicare Part D claims
1,360 87% vs specialty avg
MIPS final score
76/100 7.1 pts vs avg
Specialty distribution in New Hampshire
How Dermatology Physician compares to other specialties among New Hampshire providers
Medicare quality performance, MIPS
Charles Hammer, M.D.'s 2023 MIPS final score plotted against the Dermatology Physician national average
- MIPS Final Score
- 76/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Dermatology Physician) - 76/100 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).
Charles Hammer, M.D. appears in the CMS NPPES registry as a Dermatology Physician provider holding M.D. credentials at 580 SAINT JOHNSBURY RD, Littleton, NH, 03561, with a listed phone of (603) 444-2002. NPI 1063456226 was issued on 06/16/2006.
Medicare Part D records for calendar year 2023 show 1,360 prescription claims written by this provider, covering 444 Medicare beneficiaries and totaling roughly $3.1 million in drug spend, split 27% brand-name and 73% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 76/100 for the 2023 performance year (Quality 65.3, Cost 54.7), compared with the national average of 83.1.
Dermatology Physician is a mid-sized specialty nationwide, with 14,645 enrolled providers across 53 states and an average of 729 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 | 1063456226 |
|---|---|
| Specialty | Dermatology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 06/16/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
76.0183
Final Score
Avg: 83.1
65.3198
Quality
54.7412
Cost
100
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Charles Hammer, M.D. 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.
Dartmouth-Hitchcock Clinic
Lebanon, NH
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 · Above average
Charles Hammer, M.D. - brand share 27.0%
Dermatology Physician average
27% brand-name claims vs 73% generic, on 1,360 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.
1,360
Total Claims
$3.1M
Total Drug Cost
444
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,825
- Total Day Supply
- 48,842
- Brand vs Generic
- 27% brand / 73% generic
- Brand Drug Cost
- $3.0M
- Generic Drug Cost
- $47K
- Antibiotic Claims
- 62
Patient Demographics
- Average Patient Age
- 73.9 years
- Avg HCC Risk Score
- 0.94
- Gender Split
- 50% female / 50% male
- Age Distribution
- <65: 34, 65-74: 192, 75-84: 172, 85+: 46
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Charles Hammer, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Triamcinolone Acet…
Triamcinolone Acetonide
164 claims
- Fluorouracil
Fluorouracil
103 claims
- Cosentyx Sensoread…
Cosentyx Sensoready (2 Pens)
79 claims
- Methotrexate
Methotrexate
78 claims
- Humira Pen
Humira Pen
66 claims
- Ketoconazole
Ketoconazole
66 claims
- Clobetasol Propion… 55
Clobetasol Propionate
55 claims
- Enbrel Sureclick 43
Enbrel Sureclick
43 claims
| Drug | Claims |
|---|---|
| Triamcinolone Acetonide | 164 |
| Fluorouracil | 103 |
| Cosentyx Sensoready (2 Pens) Secukinumab | 79 |
| Methotrexate Methotrexate Sodium | 78 |
| Humira Pen Adalimumab | 66 |
| Ketoconazole | 66 |
| Clobetasol Propionate | 55 |
| Enbrel Sureclick Etanercept | 43 |
| Metronidazole | 43 |
| Betamethasone Dipropionate | 41 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Dermatology Physician Overview
How Charles Hammer, M.D. fits within the Dermatology Physician landscape nationally.
14,645
Dermatology Physician Providers in US
53
States with Dermatology Physician
729
Avg Claims per Provider
Charles Hammer, M.D.'s 1,360 claims are above the specialty average of 729.
Nearby Dermatology Physician Providers in New Hampshire
Other clinicians with the same primary specialty enrolled in New Hampshire, drawn from the same CMS NPPES roster as Hammer.
Dr. Denise Aaron
M.D.
Lebanon, NH
Dr. Rana Abdat
MD
Nashua, NH
Dr. Hamad Alabdulrazzaq
MD
Manchester, NH
Dr. Mahin Alamgir
MD
Keene, NH
Dr. Hagger Ali
MD
Portsmouth, NH
Compare Dermatology 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 New Hampshire medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Dermatology 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 Charles Hammer, M.D.'s specialty? ▼
Charles Hammer, M.D. specializes in Dermatology Physician and practices in Littleton, New Hampshire. Credentials: M.D..
How much does Charles Hammer, M.D. prescribe under Medicare Part D? ▼
In 2023, Charles Hammer, M.D. wrote 1,360 Medicare Part D claims totaling $3.1M in drug costs for 444 beneficiaries.
What is Charles Hammer, M.D.'s Medicare quality score? ▼
Charles Hammer, M.D. has a CMS MIPS Final Score of 76/100 (Quality: 65.3, Cost: 54.7). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Charles Hammer, M.D. located? ▼
Charles Hammer, M.D. is located at 580 SAINT JOHNSBURY RD, Littleton, NH, 03561. Phone: (603) 444-2002.
What is Charles Hammer, M.D.'s NPI number? ▼
Charles Hammer, M.D.'s National Provider Identifier (NPI) is 1063456226, issued on 06/16/2006.
Does Charles Hammer, M.D. prescribe more brand-name or generic drugs? ▼
Charles Hammer, M.D.'s prescribing is 27% brand-name and 73% generic drugs by claim count, with $3.0M in brand drug costs.
How many Dermatology Physician providers are there in the US? ▼
There are 14,645 Dermatology Physician providers across 53 states in the US. The average Dermatology Physician provider writes 729 Medicare Part D claims per year.
What drugs does Charles Hammer, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Charles Hammer, M.D.'s most frequently prescribed drugs include Triamcinolone Acetonide, Fluorouracil, Cosentyx Sensoready (2 Pens). This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Charles Hammer, M.D. accept Medicare? ▼
Charles Hammer, M.D. appears in CMS Medicare data with 1,360 Part D claims and 444 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Charles Hammer, M.D.'s credentials? ▼
Charles Hammer, M.D.'s NPI is 1063456226 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.