Rex Keith Kessler, M.D.
Endocrinology, Diabetes & Metabolism Physician · Aston, PA
Rex Keith Kessler, M.D. is an endocrinology, diabetes & metabolism physician with a practice address in Aston, Pennsylvania, and NPI 1841298023, issued on Jul 12, 2005. Check the license (Pennsylvania MD 020904E, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Rex Keith Kessler
- Credential
- M.D.
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- MD 020904E PA
Self-reported in NPPES; status is on the state search - Practice location
- 2901 Dutton Mill RD, Aston, PA 19014
- Phone
- (610) 876-2300
- Enumerated
- Jul 12, 2005
- Record last updated
- Jul 26, 2026
- Fax
- (610) 876-3004
- Medicaid ID
- 001612715-0006 PA
- Medicare enrollment
- Enrolled (PECOS I20050308000418); accepts Medicare assignment
- Medical or professional school
- Temple University School Of Medicine, 1977
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 485 in Pennsylvania → Look up another NPI →
Also registered at 2901 Dutton Mill RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Rex Keith Kessler in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD 020904ECheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
1% more Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
2,647 Medicare Part D claims for 315 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 50% of claims.
Most prescribed
- Metformin Hcl Er194 claims
- Levothyroxine Sodium152 claims
- Nano 2nd Gen Pen Needle118 claims
- Lantus Solostar115 claims
- Repaglinide112 claims
- Metformin Hcl111 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): 95.8 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).
Industry payments in 2024: $20.62
1 payment: food and beverage; the largest payer was Inspire Medical Systems, Inc. The 5,661 providers of this specialty with any payment received $5,742.15 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Rex Keith Kessler among 485 endocrinology, diabetes & metabolism physician records in Pennsylvania
Rex Keith Kessler, M.D. is one of 485 endocrinology, diabetes & metabolism physician records with a practice address in Pennsylvania. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 93% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated1977 · median 2004 among the 334 with a school on file
- Record last updated2026 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in Pennsylvania
There are 485 endocrinology, diabetes & metabolism physician records in Pennsylvania.
All 485 in Pennsylvania → Every provider in Aston → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Ruth Ann Fitzpatrick, MDChester, PA 190131801972534
- Praveena Gandikota, MDUpland, PA 190131285849513
- Lawrence Wallach, MDChester, PA 190131558334599
- Anna Warfield, MDChester, PA 190131609952357
- Anne Depapp, MDBryn Mawr, PA 190101629428834
- Denise Joffe, MDBryn Mawr, PA 190101760675714
- Cheryl Koch, M.D.Bryn Mawr, PA 190101790707198
- Violeta Popii, MDBryn Mawr, PA 190101306847835
Common questions
What is Rex Keith Kessler, M.D.'s NPI number?
Rex Keith Kessler, M.D.'s National Provider Identifier (NPI) is 1841298023, issued on Jul 12, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Rex Keith Kessler, M.D. located?
The NPPES record lists a practice address at 2901 Dutton Mill RD, Aston, PA, 19014. Phone: (610) 876-2300. Providers update this record themselves, so call before visiting.
How can I verify Rex Keith Kessler, M.D.'s license?
NPPES lists Pennsylvania license number MD 020904E, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Rex Keith Kessler, M.D. prescribe under Medicare Part D?
In 2024, Rex Keith Kessler, M.D. had 2,647 Medicare Part D claims for 315 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. Part D covers Medicare prescriptions only.
What is Rex Keith Kessler, M.D.'s MIPS final score?
The 2023 MIPS final score is 95.8 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.