J Gen Intern Med
ColonoscopyColorectal NeoplasmsDelayed Diagnosis
Dr. Siddhartha Y. Parker, MD
NPI1417117532PAC ID2062691058
- Medicare services, 2024
- 618
- Medicare patients, 2024
- 339
- Part D claims, 2024
- 214
- Publications
- 4
- MIPS score, 2024
- 80
- Practice address
- 1 Medical Center Drive, Lebanon, NH 03756
- Practice phone
- Call (603) 650-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Parker'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. Siddhartha Y. Parker is a gastroenterologist in Lebanon, New Hampshire
Dr. Parker practices at Dartmouth Hitchcock Medical Center in Lebanon, New Hampshire, part of Dartmouth-Hitchcock Health.
Dr. Parker's NPI, 1417117532, was assigned on June 12, 2008. Dr. Parker graduated from Tufts University School of Medicine in 2008. Dr. Parker holds New Hampshire license 16649.
NPI and contact details
- NPI
- 1417117532NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2062691058
- NPI enumeration date
- June 12, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (603) 650-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 44
- Medical school graduation
- 2008
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Siddhartha Y. Parker practices at Dartmouth Hitchcock Medical Center in Lebanon, New Hampshire
Dr. Parker's primary practice is Dartmouth Hitchcock Medical Center, at 1 Medical Center Drive, Lebanon, NH 03756 in Grafton County. The practice phone is (603) 650-5000.
- Dartmouth Hitchcock Medical Center1 Medical Center Drive, Lebanon, NH 03756 · Grafton CountyPhone(603) 650-5000
Source: Dmand AI Affiliation Data
Dr. Siddhartha Y. Parker is affiliated with 6 sites of care and 3 medical groups
Dr. Parker's primary practice is Dartmouth Hitchcock Medical Center in Lebanon, New Hampshire, part of Dartmouth-Hitchcock Health. Dr. Parker is also affiliated with New London Hospital. The medical group on file is Dartmouth Hitchcock Clinics Manchester. Dmand AI also links Dr. Parker to 3 more hospitals, 2 medical groups and 1 group practice or clinic, each named with a free account.
New London HospitalDartmouth Hitchcock Clinics Manchester3 hospitalsNames with a free account2 medical groupsNames with a free account1 group practice or clinicName with a free account
See all 9 affiliations for Dr. ParkerSources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Siddhartha Y. Parker's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Parker practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dartmouth Hitchcock Medical Center | Available with a free account |
| +5 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Siddhartha Y. Parker is one of 87 gastroenterologists in New Hampshire
Gastroenterology is Dr. Parker's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Parker is licensed in New Hampshire.
Specialties and state licenses
- Gastroenterology, New HampshirePrimary
Gastroenterologists near Dr. Parker
Counts of gastroenterologists with a Dmand AI profile, by place and practice. Each opens the list.
87gastroenterologists in New Hampshire25gastroenterologists in Lebanon25gastroenterologists at Dartmouth Hitchcock Medical Center
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Siddhartha Y. Parker billed Medicare for 618 services in 2024
CMS data shows 618 Medicare services from Dr. Parker across 14 procedure codes in 2024, for 339 Medicare patients. Medicare paid $49,367 for them.
Medicare services, 2024618
Medicare patients339
Paid by Medicare$49,367
Procedure codes14
Dr. Parker's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Surgery
- 2023: 3992024: 28030%
- Other services
- 2023: 1262024: 18446%
- Office and hospital visits
- 2023: 1322024: 1331%
- Tests and treatments
- 2023: 122024: 2175%
Where Dr. Parker's Medicare services took place, 2024
- In an office295%
- In a facility58995%
Dr. Parker compared with the New Hampshire median for gastroenterologists, 2024
- Dr. Parker
- New Hampshire median
- Medicare services
- 618vs 49226% above
- Medicare patients
- 339vs 3575% below
- Part D claims
- 135vs 22841% below
Medians across 82 gastroenterologists in New Hampshire with Dmand AI profiles that report each measure.
Dr. Parker'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. Parker and other gastroenterologists in New Hampshire.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Siddhartha Y. Parker treated 339 Medicare patients in 2024, average age 71
CMS counts 339 Medicare patients who saw Dr. Parker in 2024. The largest group is 65 to 74, with 166 patients. 63% of them have high blood pressure, and 59% have high cholesterol. 11% are also on Medicaid. Their average risk score is 1.26, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Parker's median patient age at 59, with 51% women.
Medicare patients, 2024339
Average age71
Average risk score1.26
Also on Medicaid11%
Dr. Parker's Medicare patients by age, 2024
Dr. Parker's Medicare patients by sex, 2024
- Women16649%
- Men17351%
Chronic conditions among Dr. Parker's Medicare patients, 2024
- High blood pressure63%
- High cholesterol59%
- Arthritis42%
- Mood disorders32%
- Depression28%
- Anxiety27%
- Ischemic heart disease24%
- Atrial fibrillation22%
Share of Medicare patients with each condition. A patient can have several.
Dr. Parker's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 59
Patient panel by sex, all payers
- Women51%
- Men49%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Siddhartha Y. Parker wrote 214 Medicare Part D claims in 2024
In 2024, Dr. Parker wrote 214 Medicare Part D claims for 60 patients. 66% of them were for generic drugs. CMS names the drug for 135 of them, across 6 drugs with 11 or more claims each, at $489,857 in total drug cost. In 2023, CMS named 138 claims across 5 drugs.
Part D claims, 2024214
Drugs named by CMS6
Total drug cost$489,857
Part D patients60
Dr. Parker's Part D claims by kind of drug, 2024
- Generic141 claims66%
- Brand-name73 claims34%
Dr. Parker'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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1382024: 1352%
Drugs named by CMS: 6 in 2024, 5 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. Siddhartha Y. Parker scored 80 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 80 out of 100 for Dr. Parker for performance year 2024, reported through an alternative payment model (APM). Dr. Parker accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Parker as offering telehealth. CMS counts 175 procedures of colonoscopy by Dr. Parker, more than 91% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Parker's MIPS scores, performance year 2024
- 80of 100Final score
- 53.5of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Parker ranks in Medicare procedure volume
- Colonoscopy
- 91st percentile175 procedures
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 87th percentile168 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. Siddhartha Y. Parker has 4 publications on record
Dmand AI links 4 papers to Dr. Parker in 2018. The most frequent topics are Colonoscopy, Colorectal Neoplasms and Early Detection of Cancer. Dr. Parker's most frequent co-authors are Corey A. Siegel, MD, Scott L. Gabbard, MD and Zilla Huma Hussain, MD.
Papers4
Topics Dr. Parker writes about most
- Colonoscopy
- Colorectal Neoplasms
- Early Detection of Cancer
Dr. Parker's most frequent co-authors
- Corey A. Siegel, MD2 shared papers
- Scott L. Gabbard, MD1 shared paper
- Zilla Huma Hussain, MD1 shared paper
Recent publications by Dr. Parker
Inflamm Bowel Dis
Colitis, UlcerativeCrohn DiseaseImmunocompromised Host
BiopsyDisease ProgressionEsophageal Motility Disorders
J Clin Gastroenterol
AnxietyColonoscopyColorectal Neoplasms
See who Dr. Parker researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Parker works with, so you can find a warm path to the right gastroenterologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Siddhartha Y. Parker received $214 in industry payments from 2018 to 2022
CMS Open Payments shows 2 general payments to Dr. Parker from 2 drug and device companies from 2018 to 2022. Speaker and faculty fees make up the largest share, 70% of the total. Takeda Pharmaceuticals U.S.A., Inc. paid the most, $150.
General payments to Dr. Parker by program year, 2018 to 2022
General payments to Dr. Parker by kind, 2018 to 2022
$214in total
- Speaker and faculty fees$15070%
- Food and beverage$6430%
Companies that paid Dr. Parker the most, 2018 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Siddhartha Y. Parker graduated from Tufts University School of Medicine
Dr. Parker graduated from Tufts University School of Medicine in 2008.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Siddhartha Y. Parker'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)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Siddhartha Y. Parker
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. Siddhartha Y. Parker's NPI number?
Dr. Siddhartha Y. Parker's NPI number is 1417117532. It was assigned on June 12, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. Siddhartha Y. Parker?
Dr. Siddhartha Y. Parker is a gastroenterologist in Lebanon, New Hampshire. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Siddhartha Y. Parker practice?
Dr. Parker practices at 1 Medical Center Drive, Lebanon, NH 03756. Dr. Parker's primary practice is Dartmouth Hitchcock Medical Center in Lebanon, New Hampshire, part of Dartmouth-Hitchcock Health. Dmand AI also links Dr. Parker to 3 hospitals, 2 medical groups and 1 group practice or clinic.
What is Dr. Siddhartha Y. Parker's office phone number?
The practice phone on file for Dr. Parker is (603) 650-5000.
What is Dr. Siddhartha Y. Parker's medical license number?
Dr. Parker holds New Hampshire license 16649.
Which hospitals is Dr. Siddhartha Y. Parker affiliated with?
Dr. Parker practices at Dartmouth Hitchcock Medical Center in Lebanon, New Hampshire. Dr. Parker is also affiliated with New London Hospital. Dmand AI links Dr. Parker to 3 more hospitals.
What medical group is Dr. Siddhartha Y. Parker part of?
Dr. Parker is linked to Dartmouth Hitchcock Clinics Manchester. Dmand AI links Dr. Parker to 2 more medical groups.
Does Dr. Siddhartha Y. Parker accept Medicare?
Yes. CMS data shows Dr. Parker billed Medicare for 618 services in 2024, and Dr. Parker accepts Medicare assignment.
Does Dr. Siddhartha Y. Parker offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Parker as offering telehealth services.
What is Dr. Siddhartha Y. Parker's MIPS score?
Dr. Parker's MIPS final score for performance year 2024 is 80 out of 100, reported through an alternative payment model (APM).
Show 8 more questionsShow fewer questions
How many Medicare patients does Dr. Siddhartha Y. Parker see?
CMS counts 339 Medicare patients who saw Dr. Parker in 2024, with an average age of 71.
What services does Dr. Siddhartha Y. Parker bill to Medicare?
In 2024, Dr. Parker's most billed Medicare services were medicare service (G0500), surgery: digestive system (45385) and surgery: digestive system (43239).
Where did Dr. Siddhartha Y. Parker go to medical school?
Dr. Parker graduated from Tufts University School of Medicine in 2008.
What drugs does Dr. Siddhartha Y. Parker prescribe most?
In 2024 Medicare Part D data, Dr. Parker's most prescribed drugs by claims were Mesalamine, Omeprazole and Stelara.
Has Dr. Siddhartha Y. Parker received payments from drug or device companies?
CMS Open Payments shows $214 in general payments to Dr. Parker from 2 companies from 2018 to 2022. The largest total came from Takeda Pharmaceuticals U.S.A., Inc.
How long has Dr. Siddhartha Y. Parker been practicing?
Dr. Parker graduated from medical school in 2008, 18 years ago.
Does Dr. Siddhartha Y. Parker do research?
Dmand AI links 4 publications to Dr. Parker.
Who does Dr. Siddhartha Y. Parker publish with?
Dr. Parker's most frequent co-authors are Corey A. Siegel, MD (2 shared papers), Scott L. Gabbard, MD (1 shared paper) and Zilla Huma Hussain, MD (1 shared paper).
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