Karen Haessler, PA-C
Medical Physician Assistant · Cambridge, MA
Karen Haessler, PA-C is a medical physician assistant with a practice address in Cambridge, Massachusetts, and NPI 1669844064, issued on Oct 24, 2015. Check the license (Massachusetts PA5584, as entered in NPPES) with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Karen Haessler
- Credential
- PA-C
- Primary taxonomy
- Medical Physician Assistant 363AM0700X
- License number
- PA5584 MA
Self-reported in NPPES; status is on the state search - Practice location
- 1493 Cambridge St, Cambridge, MA 02139
- Phone
- (781) 771-8076
- Enumerated
- Oct 24, 2015
- Record last updated
- Mar 30, 2016 (not updated in 10 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20160511001596); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest medical physician assistant records → All 886 in Massachusetts → Look up another NPI →
Also registered at 1493 Cambridge St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Omar Abbas, MDStudent in an Organized Health Care Education/Training Program1225728025
- Nawyaab Abbasi, DOStudent in an Organized Health Care Education/Training Program1215875364
- Flannery AbbeySocial Worker1508604273
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- Khaleel Abdul-Jabbaar, PT, DPTOrthopedic Physical Therapist1780295717
- Adri Abou-Bakr, MDStudent in an Organized Health Care Education/Training Program1770421844
Verify Karen Haessler in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
Search for license PA5584Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
79% fewer Medicare Part D claims than the average medical physician assistant in 2024
245 Medicare Part D claims for 76 beneficiaries, against an average of 1,148 among the 23,801 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims.
Most prescribed
- Buprenorphine-Naloxone166 claims
- Suboxone35 claims
- Levetiracetam19 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): 91.4 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
- Beth Israel Lahey Health Specialty Care, Inc.Gloucester, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Karen Haessler among 886 medical physician assistant records in Massachusetts
Karen Haessler, PA-C is one of 886 medical physician assistant records with a practice address in Massachusetts. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 55% of them.
- NPI issued2015 · 55% of these records are older, 40% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2015 · median 2015 among the 559 with a school on file
- Record last updated2016 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363AM0700X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Physician Assistant providers in Massachusetts
There are 886 medical physician assistant records in Massachusetts.
All 886 in Massachusetts → Every provider in Cambridge → Medical Physician Assistant nationwide →
The 8 medical physician assistant records with the nearest ZIP codes
- Emily Hanson, PA-CCambridge, MA 021391760876437
- George Taylor, PA-CCambridge, MA 021391598731143
- Louise Dias, PACambridge, MA 021381063614188
- Sara Lafreniere, PACambridge, MA 021381285243311
- Kathryn Moore, PA-CCambridge, MA 021381699307538
- Pamela Slatcher, PACambridge, MA 021381932164357
- Hayden Smith, PACambridge, MA 021381679225015
- Elizabeth Thidemann, PA-CCambridge, MA 021381629791975
Common questions
What is Karen Haessler, PA-C's NPI number?
Karen Haessler, PA-C's National Provider Identifier (NPI) is 1669844064, issued on Oct 24, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Karen Haessler, PA-C located?
The NPPES record lists a practice address at 1493 Cambridge St, Cambridge, MA, 02139. Phone: (781) 771-8076. Providers update this record themselves, so call before visiting.
How can I verify Karen Haessler, PA-C's license?
NPPES lists Massachusetts license number PA5584, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
How much does Karen Haessler, PA-C prescribe under Medicare Part D?
In 2024, Karen Haessler, PA-C had 245 Medicare Part D claims for 76 beneficiaries; the average among medical physician assistant prescribers was 1,148. Part D covers Medicare prescriptions only.
What is Karen Haessler, PA-C's MIPS final score?
The 2023 MIPS final score is 91.4 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.