Dr. Clarisa C. Hammer, DO
- Medicare services, 2024
- 30
- Medicare patients, 2024
- 45
- Part D claims, 2024
- 120
- MIPS score, 2024
- 92
- Hospital affiliations
- 2
- Practice address
- 4660 Kenmore Ave, Alexandria, VA 22304
- Practice phone
- Call (703) 698-8960
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Gastroenterology Associates of Northern Virginia, LLC
Alexandria, Virginia
Find Dr. Hammer's professional email, personal email and mobile number
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Dr. Clarisa C. Hammer is a plastic and reconstructive surgery physician in Alexandria, Virginia
Dr. Hammer practices at Gastroenterology Associates of Northern Virginia, LLC in Alexandria, Virginia.
Dr. Hammer's NPI, 1386764504, was assigned on March 30, 2007. Dr. Hammer graduated from Lake Erie College of Osteopathic Medicine, Erie in 2002. Dr. Hammer holds Virginia license 0102203916.
- NPI
- 1386764504NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4082705058
- NPI enumeration date
- March 30, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (703) 698-8960
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 50
- Medical school graduation
- 2002
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Clarisa C. Hammer practices at Gastroenterology Associates of Northern Virginia, LLC in Alexandria, Virginia
Dr. Hammer's primary practice is Gastroenterology Associates of Northern Virginia, LLC, at 4660 Kenmore Ave, Alexandria, VA 22304 in Alexandria City. The practice phone is (703) 698-8960.
- Gastroenterology Associates of Northern Virginia, LLC4660 Kenmore Ave, Alexandria, VA 22304 · Alexandria CityPhone(703) 698-8960
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Clarisa C. Hammer is affiliated with 4 sites of care and 1 medical group
Dr. Hammer's primary practice is Gastroenterology Associates of Northern Virginia, LLC in Alexandria, Virginia. Dr. Hammer is also affiliated with Inova Alexandria Hospital. The medical group on file is Affiliates in Plastic Surgery. Dmand AI also links Dr. Hammer to 1 more hospital and 1 group practice or clinic, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Clarisa C. Hammer's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hammer practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Gastroenterology Associates of Northern Virginia, LLC | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Clarisa C. Hammer is one of 77 plastics and reconstructive surgery physicians in Virginia
Plastic and reconstructive surgery is Dr. Hammer's primary specialty in the NPI Registry, under taxonomy code 2086S0122X. Dmand AI has Dr. Hammer's licenses on file in 4 states: Virginia, California, Maryland and Ohio.
Specialties and state licenses
- Plastic and reconstructive surgery, VirginiaPrimary
- California license
- Maryland license
- Surgery, Ohio
Plastics and reconstructive surgery physicians near Dr. Hammer
Counts of plastics and reconstructive surgery physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Clarisa C. Hammer billed Medicare for 30 services in 2024
CMS data shows 30 Medicare services from Dr. Hammer across 2 procedure codes in 2024, all of them office visits, for 45 Medicare patients. Medicare paid $1,543 for them. Every service was in an office.
Dr. Hammer's Medicare services by type, 2021 to 2024
- 2021
- 2024
- Office and hospital visits
- 2021: 182024: 3067%
Dr. Hammer compared with the Virginia median for plastics and reconstructive surgery physicians, 2024
- Dr. Hammer
- Virginia median
- Medicare services
- 30vs 8163% below
- Medicare patients
- 45vs 6126% below
- Part D claims
- 89vs 293.1 times
Medians across 70 plastics and reconstructive surgery physicians in Virginia with Dmand AI profiles that report each measure.
Dr. Hammer's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Hammer and other plastics and reconstructive surgery physicians in Virginia.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Clarisa C. Hammer treated 45 Medicare patients in 2024, average age 71
CMS counts 45 Medicare patients who saw Dr. Hammer in 2024. The largest group is 65 to 74, with 27 patients. 71% of them have high blood pressure, and 69% have high cholesterol. Their average risk score is 1.36, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Hammer's median patient age at 52, with 91% women.
Dr. Hammer's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Chronic conditions among Dr. Hammer's Medicare patients, 2024
- High blood pressure71%
- High cholesterol69%
- Cancer53%
- Arthritis42%
- Diabetes24%
Share of Medicare patients with each condition. A patient can have several.
Dr. Hammer's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 52
Patient panel by sex, all payers
- Women91%
- Men8%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Clarisa C. Hammer wrote 120 Medicare Part D claims in 2024
In 2024, Dr. Hammer wrote 120 Medicare Part D claims for 30 patients. 97% of them were for generic drugs. CMS names the drug for 89 of them, across 4 drugs with 11 or more claims each, at $482 in total drug cost. In 2023, CMS named 25 claims across 2 drugs.
Dr. Hammer's Part D claims by kind of drug, 2024
- Generic116 claims97%
- Brand-name and other4 claims3%
Dr. Hammer's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Hammer's Part D claims, 2024
- Opioids21%25 of 120 claims
- Antibiotics35%42 of 120 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 252024: 89256%
Drugs named by CMS: 4 in 2024, 2 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Clarisa C. Hammer scored 92 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 92 out of 100 for Dr. Hammer for performance year 2024, reported as part of a group. Dr. Hammer accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 18 procedures of melanoma (skin cancer) excision by Dr. Hammer, more than 73% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Dr. Hammer's MIPS scores, performance year 2024
- 92of 100Final score
- 100of 100Quality
- 40of 100Improvement Activities
- 73of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Hammer ranks in Medicare procedure volume
- Melanoma (skin cancer) excision
- 73rd percentile18 procedures
- Mastectomy
- 70th percentile14 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. Clarisa C. Hammer received $14,917 in industry payments from 2016 to 2025
CMS Open Payments shows 91 general payments to Dr. Hammer from 18 drug and device companies from 2016 to 2025. Travel and lodging make up the largest share, 54% of the total. Allergan Inc. paid the most, $7,549.
General payments to Dr. Hammer by program year, 2016 to 2025
General payments to Dr. Hammer by kind, 2016 to 2025
- Travel and lodging$7,99554%
- Food and beverage$5,32136%
- Consulting fees$1,60011%
Companies that paid Dr. Hammer the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Clarisa C. Hammer graduated from Lake Erie College of Osteopathic Medicine, Erie
Dr. Hammer graduated from Lake Erie College of Osteopathic Medicine, Erie in 2002.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Clarisa C. Hammer's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Clarisa C. Hammer
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Clarisa C. Hammer's NPI number?
Dr. Clarisa C. Hammer's NPI number is 1386764504. It was assigned on March 30, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Clarisa C. Hammer?
Dr. Clarisa C. Hammer is a plastic and reconstructive surgery physician in Alexandria, Virginia. The primary specialty in the NPI Registry is Plastic and Reconstructive Surgery Physician (taxonomy code 2086S0122X).
Where does Dr. Clarisa C. Hammer practice?
Dr. Hammer practices at 4660 Kenmore Ave, Alexandria, VA 22304. Dr. Hammer's primary practice is Gastroenterology Associates of Northern Virginia, LLC in Alexandria, Virginia. Dmand AI also links Dr. Hammer to 1 hospital and 1 group practice or clinic.
What is Dr. Clarisa C. Hammer's office phone number?
The practice phone on file for Dr. Hammer is (703) 698-8960.
What is Dr. Clarisa C. Hammer's medical license number?
Dr. Hammer holds Virginia license 0102203916, one of the licenses on file in 4 states.
Which states has Dr. Clarisa C. Hammer been licensed in?
Dmand AI has state licenses on file for Dr. Hammer in Virginia, California, Maryland and Ohio.
Which hospitals is Dr. Clarisa C. Hammer affiliated with?
Dr. Hammer is affiliated with Inova Alexandria Hospital. Dmand AI links Dr. Hammer to 1 more hospital.
What medical group is Dr. Clarisa C. Hammer part of?
Dr. Hammer is linked to Affiliates in Plastic Surgery.
Does Dr. Clarisa C. Hammer accept Medicare?
Yes. CMS data shows Dr. Hammer billed Medicare for 30 services in 2024, and Dr. Hammer accepts Medicare assignment.
What is Dr. Clarisa C. Hammer's MIPS score?
Dr. Hammer's MIPS final score for performance year 2024 is 92 out of 100, reported as part of a group.
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How many Medicare patients does Dr. Clarisa C. Hammer see?
CMS counts 45 Medicare patients who saw Dr. Hammer in 2024, with an average age of 71.
What services does Dr. Clarisa C. Hammer bill to Medicare?
In 2024, Dr. Hammer's most billed Medicare services were office visit, established patient (99212) and office visit, established patient (99213).
Where did Dr. Clarisa C. Hammer go to medical school?
Dr. Hammer graduated from Lake Erie College of Osteopathic Medicine, Erie in 2002.
What drugs does Dr. Clarisa C. Hammer prescribe most?
In 2024 Medicare Part D data, Dr. Hammer's most prescribed drugs by claims were Fluconazole, Oxycodone HCl and Cephalexin.
Has Dr. Clarisa C. Hammer received payments from drug or device companies?
CMS Open Payments shows $14,917 in general payments to Dr. Hammer from 18 companies from 2016 to 2025. The largest total came from Allergan Inc.
How long has Dr. Clarisa C. Hammer been practicing?
Dr. Hammer graduated from medical school in 2002, 24 years ago.
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