Dr. John Seneka Rajapakse, MD
- Medicare services, 2024
- 681
- Medicare patients, 2024
- 136
- Part D claims, 2024
- 13,211
- MIPS score, 2024
- 95
- Hospital affiliations
- 2
- Practice address
- 495 New Brunswick Ave, Perth Amboy, NJ 08861-3653
- Practice phone
- Call (732) 442-4422
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
John S Rajapakse, MD
Physician office · Perth Amboy, New Jersey
Find Dr. Rajapakse's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. John Seneka Rajapakse is an internist in Perth Amboy, New Jersey
Dr. Rajapakse practices at John S Rajapakse, MD in Perth Amboy, New Jersey.
Dr. Rajapakse's NPI, 1639377914, was assigned on July 6, 2007. Dr. Rajapakse holds New Jersey license 25MA08277300.
- NPI
- 1639377914NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4284713595
- NPI enumeration date
- July 6, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (732) 442-4422
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 49
- Medical school graduation
- 2003
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John Seneka Rajapakse practices at John S Rajapakse, MD in Perth Amboy, New Jersey
Dr. Rajapakse's primary practice is John S Rajapakse, MD, at 495 New Brunswick Ave, Perth Amboy, NJ 08861-3653. The practice phone is (732) 442-4422.
- John S Rajapakse, MD495 New Brunswick Ave, Perth Amboy, NJ 08861-3653Phone(732) 442-4422
Source: Dmand AI Affiliation Data
Dr. John Seneka Rajapakse is affiliated with 5 sites of care
Dr. Rajapakse's primary practice is John S Rajapakse, MD in Perth Amboy, New Jersey. Dr. Rajapakse is also affiliated with Raritan Bay Medical Center. Dmand AI also links Dr. Rajapakse to 1 more hospital, 1 home health agency and 1 skilled nursing facility, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. John Seneka Rajapakse's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Rajapakse practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| John S Rajapakse, MD | Available with a free account |
| +4 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John Seneka Rajapakse is one of 4,226 internists in New Jersey
Internal medicine is Dr. Rajapakse's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Rajapakse is licensed in New Jersey.
Specialties and state licenses
- Internal medicine, New JerseyPrimary
Internists near Dr. Rajapakse
Counts of internists 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 Seneka Rajapakse billed Medicare for 681 services in 2024
CMS data shows 681 Medicare services from Dr. Rajapakse across 6 procedure codes in 2024, for 136 Medicare patients. Medicare paid $47,051 for them.
Dr. Rajapakse's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 6452024: 6194%
- Other services
- 2023: 622024: 62No change
Where Dr. Rajapakse's Medicare services took place, 2024
- In an office42362%
- In a facility25838%
Dr. Rajapakse compared with the New Jersey median for internists, 2024
- Dr. Rajapakse
- New Jersey median
- Medicare services
- 681vs 7236% below
- Medicare patients
- 136vs 23141% below
- Part D claims
- 12,563vs 83015.1 times
Medians across 4,086 internists in New Jersey with Dmand AI profiles that report each measure.
Dr. Rajapakse'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. Rajapakse and other internists in New Jersey.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John Seneka Rajapakse treated 136 Medicare patients in 2024, average age 66
CMS counts 136 Medicare patients who saw Dr. Rajapakse in 2024. The largest group is 65 to 74, with 53 patients. 75% of them have high blood pressure, and 68% have high cholesterol. 60% are also on Medicaid. Their average risk score is 1.39, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Rajapakse's median patient age at 56, with 57% women.
Dr. Rajapakse's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Rajapakse's Medicare patients by sex, 2024
- Women6649%
- Men7051%
Chronic conditions among Dr. Rajapakse's Medicare patients, 2024
- High blood pressure75%
- High cholesterol68%
- Anxiety53%
- Mood disorders40%
- Arthritis39%
- Diabetes35%
- Depression32%
- Tobacco use30%
Share of Medicare patients with each condition. A patient can have several.
Dr. Rajapakse's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 56
Patient panel by sex, all payers
- Women57%
- Men41%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John Seneka Rajapakse wrote 13,211 Medicare Part D claims in 2024
In 2024, Dr. Rajapakse wrote 13,211 Medicare Part D claims for 332 patients. 84% of them were for generic drugs. CMS names the drug for 12,563 of them, across 172 drugs with 11 or more claims each, at $873,487 in total drug cost. In 2023, CMS named 11,491 claims across 168 drugs.
Dr. Rajapakse's Part D claims by kind of drug, 2024
- Generic11,084 claims84%
- Brand-name1,993 claims15%
- Other134 claims1%
Dr. Rajapakse'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. Rajapakse's Part D claims, 2024
- Opioids4%539 of 13,211 claims
- Antibiotics2%241 of 13,211 claims
- Antipsychotics, patients 65 and over1%179 of 13,211 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: 11,4912024: 12,5639%
Drugs named by CMS: 172 in 2024, 168 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 Seneka Rajapakse scored 95 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 95 out of 100 for Dr. Rajapakse for performance year 2024, reported individually. Dr. Rajapakse accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Rajapakse's MIPS scores, performance year 2024
- 95of 100Final score
- 92of 100Quality
- 40of 100Improvement Activities
- 70of 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 Seneka Rajapakse received $12,457 in industry payments from 2016 to 2025
CMS Open Payments shows 747 general payments to Dr. Rajapakse from 42 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 99% of the total. AstraZeneca Pharmaceuticals LP paid the most, $2,577.
General payments to Dr. Rajapakse by program year, 2016 to 2025
General payments to Dr. Rajapakse by kind, 2016 to 2025
- Food and beverage$12,29299%
- Consulting fees$1501%
- Education$140%
Companies that paid Dr. Rajapakse the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. John Seneka Rajapakse'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 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) |
| 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 Seneka Rajapakse
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 Seneka Rajapakse's NPI number?
Dr. John Seneka Rajapakse's NPI number is 1639377914. It was assigned on July 6, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. John Seneka Rajapakse?
Dr. John Seneka Rajapakse is an internist in Perth Amboy, New Jersey. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. John Seneka Rajapakse practice?
Dr. Rajapakse practices at 495 New Brunswick Ave, Perth Amboy, NJ 08861-3653. Dr. Rajapakse's primary practice is John S Rajapakse, MD in Perth Amboy, New Jersey. Dmand AI also links Dr. Rajapakse to 1 hospital, 1 home health agency and 1 skilled nursing facility.
What is Dr. John Seneka Rajapakse's office phone number?
The practice phone on file for Dr. Rajapakse is (732) 442-4422.
What is Dr. John Seneka Rajapakse's medical license number?
Dr. Rajapakse holds New Jersey license 25MA08277300.
Which hospitals is Dr. John Seneka Rajapakse affiliated with?
Dr. Rajapakse is affiliated with Raritan Bay Medical Center. Dmand AI links Dr. Rajapakse to 1 more hospital.
Does Dr. John Seneka Rajapakse accept Medicare?
Yes. CMS data shows Dr. Rajapakse billed Medicare for 681 services in 2024, and Dr. Rajapakse accepts Medicare assignment.
What is Dr. John Seneka Rajapakse's MIPS score?
Dr. Rajapakse's MIPS final score for performance year 2024 is 95 out of 100, reported individually.
How many Medicare patients does Dr. John Seneka Rajapakse see?
CMS counts 136 Medicare patients who saw Dr. Rajapakse in 2024, with an average age of 66.
What services does Dr. John Seneka Rajapakse bill to Medicare?
In 2024, Dr. Rajapakse's most billed Medicare services were nursing facility care (99309), office visit, established patient (99213) and office visit, established patient (99214).
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What drugs does Dr. John Seneka Rajapakse prescribe most?
In 2024 Medicare Part D data, Dr. Rajapakse's most prescribed drugs by claims were Alprazolam, Amlodipine Besylate and Hydrochlorothiazide.
Has Dr. John Seneka Rajapakse received payments from drug or device companies?
CMS Open Payments shows $12,457 in general payments to Dr. Rajapakse from 42 companies from 2016 to 2025. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. John Seneka Rajapakse been practicing?
Dr. Rajapakse graduated from medical school in 2003, 23 years ago.
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