Dr. John A. Hamjian, MD
- Medicare services, 2024
- 1,414
- Medicare patients, 2024
- 716
- Part D claims, 2024
- 2,129
- MIPS score, 2024
- 25
- Hospital affiliations
- 2
- Practice address
- 27 Park Street, Hyannis, MA 02601
- Practice phone
- Call (508) 771-1800
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Hamjian's professional email, personal email and mobile number
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Dr. John A. Hamjian is a neurologist in Hyannis, Massachusetts
Dr. Hamjian practices at Cape Cod Hospital in Hyannis, Massachusetts, part of Cape Cod Healthcare.
Dr. Hamjian's NPI, 1124120613, was assigned on September 4, 2006. Dr. Hamjian graduated from Saint Louis University School of Medicine in 1987. Dr. Hamjian holds Massachusetts license 80980.
- NPI
- 1124120613NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2062454069
- NPI enumeration date
- September 4, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (508) 771-1800
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 65
- Medical school graduation
- 1987
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John A. Hamjian practices at Cape Cod Hospital in Hyannis, Massachusetts
Dr. Hamjian's primary practice is Cape Cod Hospital, at 27 Park Street, Hyannis, MA 02601 in Barnstable County. The practice phone is (508) 771-1800.
- Cape Cod Hospital27 Park Street, Hyannis, MA 02601 · Barnstable CountyPhone(508) 771-1800
Source: Dmand AI Affiliation Data
Dr. John A. Hamjian is affiliated with 3 sites of care
Dr. Hamjian's primary practice is Cape Cod Hospital in Hyannis, Massachusetts, part of Cape Cod Healthcare. Dr. Hamjian is also affiliated with Spaulding Rehabilitation Hospital Cape Cod. Dmand AI also links Dr. Hamjian to 1 more physician office, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John A. Hamjian's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hamjian practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Cape Cod Hospital | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Cape Cod Healthcare and 6.2K+ hospitals, with verified contacts in the same login.
Dr. John A. Hamjian is one of 806 neurologists in Massachusetts
Neurology is Dr. Hamjian's primary specialty in the NPI Registry, under taxonomy code 2084N0400X. Dr. Hamjian is licensed in Massachusetts.
Specialties and state licenses
- Neurology, MassachusettsPrimary
Neurologists near Dr. Hamjian
Counts of neurologists 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. John A. Hamjian billed Medicare for 1,414 services in 2024
CMS data shows 1,414 Medicare services from Dr. Hamjian across 11 procedure codes in 2024, for 716 Medicare patients. Medicare paid $121,905 for them. Every service was in an office.
Dr. Hamjian's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,3522024: 1,2934%
- Tests and treatments
- 2023: 1152024: 1215%
Dr. Hamjian compared with the Massachusetts median for neurologists, 2024
- Dr. Hamjian
- Massachusetts median
- Medicare services
- 1,414vs 3144.5 times
- Medicare patients
- 716vs 1784.0 times
- Part D claims
- 1,966vs 2707.3 times
Medians across 741 neurologists in Massachusetts with Dmand AI profiles that report each measure.
Dr. Hamjian'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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John A. Hamjian treated 716 Medicare patients in 2024, average age 78
CMS counts 716 Medicare patients who saw Dr. Hamjian in 2024. The largest group is 75 to 84, with 334 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 14% are also on Medicaid. Their average risk score is 1.40, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Hamjian's median patient age at 77, with 48% women.
Dr. Hamjian's Medicare patients by age, 2024
Dr. Hamjian's Medicare patients by sex, 2024
- Women34248%
- Men37452%
Chronic conditions among Dr. Hamjian's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis59%
- Mood disorders37%
- Anxiety33%
- Ischemic heart disease33%
- Chronic kidney disease32%
- Depression32%
Share of Medicare patients with each condition. A patient can have several.
Dr. Hamjian's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 77
Patient panel by sex, all payers
- Women48%
- Men51%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John A. Hamjian wrote 2,129 Medicare Part D claims in 2024
In 2024, Dr. Hamjian wrote 2,129 Medicare Part D claims for 351 patients. 96% of them were for generic drugs. CMS names the drug for 1,966 of them, across 44 drugs with 11 or more claims each, at $325,289 in total drug cost. In 2023, CMS named 1,811 claims across 49 drugs.
Dr. Hamjian's Part D claims by kind of drug, 2024
- Generic2,049 claims96%
- Brand-name55 claims3%
- Other25 claims1%
Dr. Hamjian'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. Hamjian's Part D claims, 2024
- Antipsychotics, patients 65 and over2%32 of 2,129 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: 1,8112024: 1,9669%
Drugs named by CMS: 44 in 2024, 49 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. John A. Hamjian scored 25 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 25 out of 100 for Dr. Hamjian for performance year 2024, reported individually. Dr. Hamjian accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Hamjian as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Hamjian's MIPS scores, performance year 2024
- 25of 100Final score
- 0of 100Quality
- 0of 100Improvement Activities
- 82of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. John A. Hamjian received $1,252 in industry payments from 2016 to 2020
CMS Open Payments shows 111 general payments to Dr. Hamjian from 5 drug and device companies from 2016 to 2020. Food and beverage make up the largest share, 91% of the total. Allergan Inc. paid the most, $503.
General payments to Dr. Hamjian by program year, 2016 to 2020
General payments to Dr. Hamjian by kind, 2016 to 2020
- Food and beverage$1,14191%
- Education$1119%
Companies that paid Dr. Hamjian the most, 2016 to 2020
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John A. Hamjian graduated from Saint Louis University School of Medicine
Dr. Hamjian graduated from Saint Louis University School of Medicine in 1987.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. John A. Hamjian'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 | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy 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) |
| 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. John A. Hamjian
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. John A. Hamjian's NPI number?
Dr. John A. Hamjian's NPI number is 1124120613. It was assigned on September 4, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John A. Hamjian?
Dr. John A. Hamjian is a neurologist in Hyannis, Massachusetts. The primary specialty in the NPI Registry is Neurology Physician (taxonomy code 2084N0400X).
Where does Dr. John A. Hamjian practice?
Dr. Hamjian practices at 27 Park Street, Hyannis, MA 02601. Dr. Hamjian's primary practice is Cape Cod Hospital in Hyannis, Massachusetts, part of Cape Cod Healthcare. Dmand AI also links Dr. Hamjian to 1 physician office.
What is Dr. John A. Hamjian's office phone number?
The practice phone on file for Dr. Hamjian is (508) 771-1800.
What is Dr. John A. Hamjian's medical license number?
Dr. Hamjian holds Massachusetts license 80980.
Which hospitals is Dr. John A. Hamjian affiliated with?
Dr. Hamjian practices at Cape Cod Hospital in Hyannis, Massachusetts. Dr. Hamjian is also affiliated with Spaulding Rehabilitation Hospital Cape Cod.
Does Dr. John A. Hamjian accept Medicare?
Yes. CMS data shows Dr. Hamjian billed Medicare for 1,414 services in 2024, and Dr. Hamjian accepts Medicare assignment.
Does Dr. John A. Hamjian offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Hamjian as offering telehealth services.
What is Dr. John A. Hamjian's MIPS score?
Dr. Hamjian's MIPS final score for performance year 2024 is 25 out of 100, reported individually.
How many Medicare patients does Dr. John A. Hamjian see?
CMS counts 716 Medicare patients who saw Dr. Hamjian in 2024, with an average age of 78.
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What services does Dr. John A. Hamjian bill to Medicare?
In 2024, Dr. Hamjian's most billed Medicare services were office visit, established patient (99214), office visit, established patient (99213) and office visit, new patient (99205).
Where did Dr. John A. Hamjian go to medical school?
Dr. Hamjian graduated from Saint Louis University School of Medicine in 1987.
What drugs does Dr. John A. Hamjian prescribe most?
In 2024 Medicare Part D data, Dr. Hamjian's most prescribed drugs by claims were Gabapentin, Donepezil HCl and Carbidopa-Levodopa.
Has Dr. John A. Hamjian received payments from drug or device companies?
CMS Open Payments shows $1,252 in general payments to Dr. Hamjian from 5 companies from 2016 to 2020. The largest total came from Allergan Inc.
How long has Dr. John A. Hamjian been practicing?
Dr. Hamjian graduated from medical school in 1987, 39 years ago.
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