Charles John Hammer, M.D.
Charles John Hammer is a Dermatology specialist based in Littleton, NH with over 39 years of clinical experience. Medicare-enrolled per CMS records and offers virtual telehealth visits.
Patients across NH can see Charles John Hammer, M.D. in person in Littleton or via virtual visit — no travel required. Trained at University of Maryland School of Medicine (class of 1987), he has been practicing for over 39 years. CMS Medicare data shows his patients commonly have hypertension, high cholesterol, and arthritis. CMS MIPS quality score: 76.02/100 (2023).
At a glance
- Federal MIPS score higher than 36% of MIPS-scored doctors in New Hampshire
- Virtual visits available — no app or travel required
Older · 4529dNPPES updated 2013-12-29 · verify NPI on CMS · Verify license at New Hampshire Board of Medicine
Contact & Location
Practice Location
580 Saint Johnsbury Rd Dh - Dermatology, Littleton, NH 03561-3437
How Does This Doctor Compare?
MIPS Score
202376.02/100
New Hampshire avg: 77.6 · US avg: 83.6
⚠ Lower than most doctors nationally(-7.6 pts)
How the government rates this doctor's Medicare care quality. Scores above 75 are considered good.
Generic Rx
↑ Higher = better73.1%
New Hampshire avg: 83.5 · US avg: 82.8
⚠ Lower than most doctors nationally(-9.7 pts)
How often this doctor prescribes affordable generic drugs instead of expensive brand-name ones.
Medicare Patients
1,079
Unique beneficiaries
High volumePrescription Recipients
444
Patients prescribed
Prescriptions Written
1,360
Total claims
Total Medicare drug cost: $3.06M
Percentile rankings compared against 597 reporting peers in New Hampshire.
Data Note: Sourced from CMS Medicare Provider Utilization & Payment Data. Percentile rankings compare this provider against all peers with reported data in the same state. Updated annually to reflect the latest federal reporting cycle.
What This Doctor Treats Most
Based on Medicare claims data — here's what patients commonly see this doctor for
Based on Medicare data, this doctor primarily manages Hypertension, High Cholesterol, and Arthritis.
High blood pressure — a leading risk factor for heart disease and stroke
US avg: 70.2%↓ Fewer patients than average (-7%) — less common here
Elevated cholesterol or triglycerides that increase heart disease risk
US avg: 70.4%↓ Fewer patients than average (-14%) — less common here
Joint inflammation causing pain, swelling, and stiffness
US avg: 49.3%↓ Fewer patients than average (-8%) — less common here
Percentage of this provider's Medicare patients diagnosed with each condition. Source: CMS Utilization Data.
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Background & Specialty
Education, training, and specialty classification from CMS NPPES and Medicare records.
Graduated medical school · 1987
University of Maryland School of Medicine
39 years in practice
Senior practitioner
A dermatologist is trained to diagnose and treat pediatric and adult patients with benign and malignant disorders of the skin, mouth, external genitalia, hair and nails, as well as a number of sexually transmitted diseases. The dermatologist has had additional training and experience in the diagnosis and treatment of skin cancers, melanomas, moles and other tumors of the skin, the management of contact dermatitis and other allergic and nonallergic skin disorders, and in the recognition of the skin manifestations of systemic (including internal malignancy) and infectious diseases. Dermatologists have special training in dermatopathology and in the surgical techniques used in dermatology. They also have expertise in the management of cosmetic disorders of the skin such as hair loss and scars and the skin changes associated with aging.
Taxonomy: 207N00000X
Education & Training
University of Maryland School of Medicine (Class of 1987)
Virtual Dermatology Care With Charles John Hammer
NPPES records indicate this provider offers telehealth services. Contact the office to confirm availability and scheduling.
Schedule a virtual visit with Charles John Hammer for blood pressure monitoring, cholesterol management, arthritis follow-ups — no travel to Littleton required. The office sends a secure video link before your appointment. Most visits take 15–30 minutes. Medicare enrolled per CMS records.
Frequently Asked Questions
Common questions about Charles John Hammer
NPI records show Dr. Hammer as active with telehealth listed in Littleton, NH. NPI status alone doesn't confirm open availability — call the office to confirm. Phone: (603) 444-2002.
Sourced from CMS NPPES · OIG LEIE · CMS QPP 2023 · CMS Medicare Part D · CMS Physician Comparator. See Data Methodology.
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Contact Charles John Hammer
Practice Location
580 Saint Johnsbury Rd Dh - Dermatology, Littleton, NH 03561-3437
Mailing Address
580 Saint Johnsbury Rd Dh - Dermatology, Littleton, NH 03561-3437
This is a provider directory. Contact the office directly to schedule appointments.
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