Karin G. Johnson, MD
Sleep Medicine (Psychiatry & Neurology) Physician · Springfield, MA
Karin G. Johnson, MD is a sleep medicine (psychiatry & neurology) physician with a practice address in Springfield, Massachusetts, and NPI 1295805075, issued on Nov 8, 2006. Check the license (Massachusetts 230775, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Karin G. Johnson
- Credential
- MD
- Primary taxonomy
- Sleep Medicine (Psychiatry & Neurology) Physician 2084S0012X
- License number
- 230775 MA
Self-reported in NPPES; status is on the state search - Practice location
- 3300 Main Street, Springfield, MA 01107
- Phone
- (413) 794-5600
- Enumerated
- Nov 8, 2006
- Record last updated
- Feb 1, 2024
- Fax
- (413) 794-7297
- Medicare enrollment
- Enrolled (PECOS I20080812000193); accepts Medicare assignment
- Medical or professional school
- University Of Chicago, Pritzker School Of Medicine, 2003
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest sleep medicine (psychiatry & neurology) physician records → All 15 in Massachusetts → Look up another NPI →
Also registered at 3300 Main Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Raul Alicea, PA-CMedical Physician Assistant1275057051
- Stuart Anfang, M.D.Psychiatry Physician1033269410
- Stacie Baldwin, PA-CMedical Physician Assistant1558518951
- George Baquis, MDNeurology Physician1912002965
Verify Karin G. Johnson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 230775Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
35% fewer Medicare Part D claims than the average sleep medicine (psychiatry & neurology) physician in 2024
425 Medicare Part D claims for 68 beneficiaries, against an average of 655 among the 377 providers of this specialty who prescribed in Part D. Brand-name drugs were 22% of claims.
Most prescribed
- Zolpidem Tartrate42 claims
- Gabapentin36 claims
- Ropinirole Hcl33 claims
- Clonazepam32 claims
- Dextroamphetamine-Amphetamine29 claims
- Sodium Oxybate22 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.
Industry payments in 2024: $212.22
10 payments; by number, the most common kind was food and beverage; the largest payer was Avadel Cns Pharmaceuticals, LLC. The 278 providers of this specialty with any payment received $5,572.43 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.
Bills Medicare through one group practice
- Baystate Medical Practices IncSpringfield, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Karin G. Johnson among 15 sleep medicine (psychiatry & neurology) physician records in Massachusetts
Karin G. Johnson, MD is one of 15 sleep medicine (psychiatry & neurology) physician records with a practice address in Massachusetts. 100% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 13% of them.
- NPI issued2006 · 13% of these records are older, 73% newer
- In a Medicare fileYes · 100% of these records are
- In the CMS Doctors and Clinicians fileYes · 80% of these records are
- Graduated2003 · median 2003 among the 12 with a school on file
- Record last updated2024 · 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 2084S0012X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Sleep Medicine (Psychiatry & Neurology) Physician providers in Massachusetts
There are 15 sleep medicine (psychiatry & neurology) physician records in Massachusetts.
All 15 in Massachusetts → Every provider in Springfield → Sleep Medicine (Psychiatry & Neurology) Physician nationwide →
The 8 sleep medicine (psychiatry & neurology) physician records with the nearest ZIP codes
- Kranti Kiran Bhagi, M.D.Springfield, MA 011071215224209
- Muhtadi Islam, MD, PHDSpringfield, MA 011991679069173
- Paul Walting, MDAmherst, MA 010021275503666
- Josna Adusumilli, MDWorcester, MA 016051568663789
- Ivia Rivera Agosto, M.D.Burlington, MA 018051790103299
- Maamie Asamoah-MensahBoston, MA 021141295312361
- Jeffrey Kim, MDBoston, MA 021141487243408
- John Winkelman, PHD/MDBoston, MA 021141619950045
Common questions
What is Karin G. Johnson, MD's NPI number?
Karin G. Johnson, MD's National Provider Identifier (NPI) is 1295805075, issued on Nov 8, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Karin G. Johnson, MD located?
The NPPES record lists a practice address at 3300 Main Street, Springfield, MA, 01107. Phone: (413) 794-5600. Providers update this record themselves, so call before visiting.
How can I verify Karin G. Johnson, MD's license?
NPPES lists Massachusetts license number 230775, 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 Karin G. Johnson, MD prescribe under Medicare Part D?
In 2024, Karin G. Johnson, MD had 425 Medicare Part D claims for 68 beneficiaries; the average among sleep medicine (psychiatry & neurology) physician prescribers was 655. 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.