David Lawrence Maslak, MD
Internal Medicine Physician · Derby, CT
David Lawrence Maslak, MD is an internal medicine physician with a practice address in Derby, Connecticut, and NPI 1477916179, issued on Mar 30, 2016. Check the license (Connecticut 62720, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- David Lawrence Maslak
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 62720 CT
323344 NY
Self-reported in NPPES; status is on the state search - Practice location
- 130 Division St, Derby, CT 06418
- Phone
- (203) 732-1330
- Enumerated
- Mar 30, 2016
- Record last updated
- Nov 27, 2024
- Fax
- (203) 732-1332
- Medicare enrollment
- Enrolled (PECOS I20190723002797); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,623 in Connecticut → Look up another NPI →
Also registered at 130 Division St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Nicholas Adams, NPNurse Practitioner1093599979
- Divya Aggarwal, MDStudent in an Organized Health Care Education/Training Program1154558401
Verify David Lawrence Maslak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 62720Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average internal medicine physician in 2024
277 Medicare Part D claims for 122 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 14 claims were for opioids.
Most prescribed
- Prednisone30 claims
- Cefpodoxime Proxetil22 claims
- Albuterol Sulfate Hfa15 claims
- Furosemide13 claims
- Oxycodone Hcl11 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 practice group's MIPS final score for 2023 (Medicare payment program): 92.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
7 hospitals and group practices
- Middlesex HospitalMiddletown, CT · Acute Care Hospitals3 of 5 stars
- Day Kimball Medical Group IncPutnam, CT
- Griffin Faculty Physicians IncDerby, CT
- New York Medical Physician Associates PCPoughkeepsie, NY
- Nuvance Health Medical Practice CT IncDanbury, CT
- Nuvance Health Medical Practice PCCarmel, NY
- The Charlotte Hungerford HospitalTorrington, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
David Lawrence Maslak among 2,623 internal medicine physician records in Connecticut
David Lawrence Maslak, MD 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 2016, is newer than 77% of them.
- NPI issued2016 · 77% of these records are older, 20% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2016 · median 2004 among the 1,646 with a school on file
- Record last updated2024 · 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).
47 internal medicine physician records list a practice address in Derby
They are 47 of the 453 NPPES records with a practice address in Derby, and 2,623 internal medicine physician records in Connecticut.
All 2,623 in Connecticut → Every provider in Derby → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Kanwardeep Arora, MDDerby, CT 064181508026428
- Earl Baker, MDDerby, CT 064181265635148
- Frederick Browne, MDDerby, CT 064181588641955
- Seema Dsouza, M.D.Derby, CT 064181851373187
- Robert Hyde, MDDerby, CT 064181902011885
- David Katz, MDDerby, CT 064181528138435
- Michael KesslerDerby, CT 064181770672180
- Gail Labadia, M.D.Derby, CT 064181649202144
Common questions
What is David Lawrence Maslak, MD's NPI number?
David Lawrence Maslak, MD's National Provider Identifier (NPI) is 1477916179, issued on Mar 30, 2016. An NPI identifies a provider in billing; it is not a license.
Where is David Lawrence Maslak, MD located?
The NPPES record lists a practice address at 130 Division St, Derby, CT, 06418. Phone: (203) 732-1330. Providers update this record themselves, so call before visiting.
How can I verify David Lawrence Maslak, MD's license?
NPPES lists Connecticut license number 62720, 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 David Lawrence Maslak, MD prescribe under Medicare Part D?
In 2024, David Lawrence Maslak, MD had 277 Medicare Part D claims for 122 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is David Lawrence Maslak, MD's MIPS final score?
The 2023 MIPS final score is 92.6 of 100, reported for the practice group. 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.