Nathaniel Parker
Internal Medicine Physician · New Haven, CT
Nathaniel Parker is an internal medicine physician with a practice address in New Haven, Connecticut, and NPI 1124511753, issued on Jun 8, 2018. Check the license (Connecticut 69153, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Nathaniel Parker
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 69153 CT
Self-reported in NPPES; status is on the state search - Practice location
- 20 York St # CB-2041, New Haven, CT 06510
- Phone
- (203) 688-4748
- Enumerated
- Jun 8, 2018
- Record last updated
- May 3, 2026
- Medicare enrollment
- Enrolled (PECOS I20210806002014); accepts Medicare assignment
- Medical or professional school
- Kansas City University Of Med & Biosciences, College Of Osteo Med, 2018
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,623 in Connecticut → Look up another NPI →
Also registered at 20 York St # CB-2041
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Peter Jenei, M.D.Hospitalist Physician1508952359
- Anika Murray, M.D.Internal Medicine Physician1760544332
Verify Nathaniel Parker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 69153Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average internal medicine physician in 2024
158 Medicare Part D claims for 68 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 43 claims were for opioids.
Most prescribed
- Oxycodone Hcl19 claims
- Morphine Sulfate12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 93.3 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Northeast Medical Group IncNew Haven, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nathaniel Parker among 2,623 internal medicine physician records in Connecticut
Nathaniel Parker is one of 2,623 internal medicine physician records with a practice address in Connecticut. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 82% of them.
- NPI issued2018 · 82% of these records are older, 15% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2018 · median 2004 among the 1,646 with a school on file
- Record last updated2026 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
329 internal medicine physician records list a practice address in New Haven
They are 329 of the 9,793 NPPES records with a practice address in New Haven, and 2,623 internal medicine physician records in Connecticut.
All 2,623 in Connecticut → Every provider in New Haven → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- William Becker, M.D.New Haven, CT 065101154427656
- William Crede, MDNew Haven, CT 065101760455984
- Robert Gifford, M.D.New Haven, CT 065101407982242
- Frederick Haeseler, MDNew Haven, CT 065101295862084
- Peter Herbert, MDNew Haven, CT 065101033191465
- Rajlakshmi Krishnamurthy, MDNew Haven, CT 065101568487346
- Chandrika Kumar, M.D.New Haven, CT 065101386645448
- Frank Mongillo, MDNew Haven, CT 065101811917289
Common questions
What is Nathaniel Parker's NPI number?
Nathaniel Parker's National Provider Identifier (NPI) is 1124511753, issued on Jun 8, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Nathaniel Parker located?
The NPPES record lists a practice address at 20 York St # CB-2041, New Haven, CT, 06510. Phone: (203) 688-4748. Providers update this record themselves, so call before visiting.
How can I verify Nathaniel Parker's license?
NPPES lists Connecticut license number 69153, as entered by the provider. Search the Connecticut Medical Examining Board at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Nathaniel Parker prescribe under Medicare Part D?
In 2024, Nathaniel Parker had 158 Medicare Part D claims for 68 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Nathaniel Parker's MIPS final score?
The 2023 MIPS final score is 93.3 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.