Joan C. Karl, M.D.
Internal Medicine Physician · Milford, MA
Joan C. Karl, M.D. is an internal medicine physician with a practice address in Milford, Massachusetts, and NPI 1316943061, issued on Jun 27, 2005. Check the license (Massachusetts 208651, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Joan C. Karl
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 208651 MA
MD10949 RI
Self-reported in NPPES; status is on the state search - Practice location
- 221 E Main St, Milford, MA 01757
- Phone
- (508) 473-7599
- Enumerated
- Jun 27, 2005
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (508) 473-1418
- Medicaid IDs
- 2075351 MA
7009986 RI - Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 221 E Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Joanna Cyr, LICSWClinical Social Worker1326372194
- Katherine D'Ascenzo, M.S.W.Social Worker1982018099
- Allison Enquist, MSW, LSWCase Manager/Care Coordinator1255809885
- Katelyn Grenier, M.AMental Health Counselor1891134755
- Hasina Hamid, MDInternal Medicine Physician1033356829
- Bridget KingSchool Counselor1508288473
Verify Joan C. Karl in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 208651Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average internal medicine physician in 2024
79 Medicare Part D claims for 11 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Albuterol Sulfate Hfa13 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.
Joan C. Karl among 6,825 internal medicine physician records in Massachusetts
Joan C. Karl, M.D. is one of 6,825 internal medicine physician records with a practice address in Massachusetts. 75% 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, 88% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2007 · 64% 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 Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
43 internal medicine physician records list a practice address in Milford
They are 43 of the 3,459 NPPES records with a practice address in Milford, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Milford → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Hesham Aboshady, M.D.Milford, MA 017571619081916
- David Carlson, M.D.Milford, MA 017571871695296
- Emmett Clemente, M.D.Milford, MA 017571699790709
- Faheem Farooq, MDMilford, MA 017571891722419
- Eugene Jagella, M.D.Milford, MA 017571992794549
- Michael Jolie, M.D.Milford, MA 017571760408827
- Colleen Murphy, M.D.Milford, MA 017571942235098
- Jay Prosnitz, M.D.Milford, MA 017571134130081
Common questions
What is Joan C. Karl, M.D.'s NPI number?
Joan C. Karl, M.D.'s National Provider Identifier (NPI) is 1316943061, issued on Jun 27, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Joan C. Karl, M.D. located?
The NPPES record lists a practice address at 221 E Main St, Milford, MA, 01757. Phone: (508) 473-7599. Providers update this record themselves, so call before visiting.
How can I verify Joan C. Karl, M.D.'s license?
NPPES lists Massachusetts license number 208651, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Joan C. Karl, M.D. prescribe under Medicare Part D?
In 2024, Joan C. Karl, M.D. had 79 Medicare Part D claims for 11 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
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.