James Allan Karlson, MD
Sports Medicine (Orthopaedic Surgery) Physician · Cambridge, MA
James Allan Karlson, MD is a sports medicine (orthopaedic surgery) physician with a practice address in Cambridge, Massachusetts, and NPI 1114915261, issued on Oct 12, 2005. Check the license (Massachusetts 74009, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- James Allan Karlson
- Credential
- MD
- Primary taxonomy
- Sports Medicine (Orthopaedic Surgery) Physician 207XX0005X
- License number
- 74009 MA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Mount Auburn St, Cambridge, MA 02138
- Phone
- (617) 491-6766
- Enumerated
- Oct 12, 2005
- Record last updated
- Aug 7, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (617) 491-2552
- Medicaid ID
- 3116956 MA
- Medicare enrollment
- Enrolled (PECOS I20040415000400); accepts Medicare assignment
- Medical or professional school
- Warren Alpert Medical School Of Brown University, 1988
- Entity
- Type 1 · individual
8 nearest sports medicine (orthopaedic surgery) physician records → All 76 in Massachusetts → Look up another NPI →
Also registered at 300 Mount Auburn St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Karen Ahlert, M.D.Surgery Physician1083819502
- John Anderson, MDGeriatric Medicine (Internal Medicine) Physician1568462620
- Daniel Asnes, M.D.Psychiatry Physician1316093628
- Julio Ayala, MDGastroenterology Physician1104883347
- Elizabeth Baker, M.D.Obstetrics & Gynecology Physician1659579969
- Paul Bertozzi, MDPulmonary Disease Physician1346312733
Verify James Allan Karlson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 74009Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
51% fewer Medicare Part D claims than the average sports medicine (orthopaedic surgery) physician in 2024
142 Medicare Part D claims for 96 beneficiaries, against an average of 288 among the 2,562 providers of this specialty who prescribed in Part D. 112 claims were for opioids.
Most prescribed
- Oxycodone Hcl70 claims
- Tramadol Hcl28 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: $29.37
1 payment: food and beverage; the largest payer was Stryker Corporation. The 2,400 providers of this specialty with any payment received $19,779.31 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 2 group practices
- Boston Orthopaedic And Spine LLCCambridge, MA
- President And Fellows OF Harvard CollegeCambridge, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
James Allan Karlson among 76 sports medicine (orthopaedic surgery) physician records in Massachusetts
James Allan Karlson, MD is one of 76 sports medicine (orthopaedic surgery) physician records with a practice address in Massachusetts. 83% 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, 82% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 79% of these records are
- Graduated1988 · median 2001 among the 60 with a school on file
- Record last updated2019 · 71% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207XX0005X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Sports Medicine (Orthopaedic Surgery) Physician providers in Massachusetts
There are 76 sports medicine (orthopaedic surgery) physician records in Massachusetts.
All 76 in Massachusetts → Every provider in Cambridge → Sports Medicine (Orthopaedic Surgery) Physician nationwide →
The 8 sports medicine (orthopaedic surgery) physician records with the nearest ZIP codes
- Thomas Burke, MDCambridge, MA 021381427047224
- Anthony Schena, MDBrighton, MA 021351952398174
- Sarav Shah, MDBrighton, MA 021351114284288
- Courtney Dawson, MDJamaica Plain, MA 021301184750820
- Xinning Li, M.D.Boston, MA 021181902914617
- Robert Nicoletta, M.D.Boston, MA 021181194705616
- Anthony Schepsis, M.D.Boston, MA 021181831147834
- Elise Bixby, MDBoston, MA 021151801327655
Common questions
What is James Allan Karlson, MD's NPI number?
James Allan Karlson, MD's National Provider Identifier (NPI) is 1114915261, issued on Oct 12, 2005. An NPI identifies a provider in billing; it is not a license.
Where is James Allan Karlson, MD located?
The NPPES record lists a practice address at 300 Mount Auburn St, Cambridge, MA, 02138. Phone: (617) 491-6766. Providers update this record themselves, so call before visiting.
How can I verify James Allan Karlson, MD's license?
NPPES lists Massachusetts license number 74009, 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 James Allan Karlson, MD prescribe under Medicare Part D?
In 2024, James Allan Karlson, MD had 142 Medicare Part D claims for 96 beneficiaries; the average among sports medicine (orthopaedic surgery) physician prescribers was 288. 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.