Margaret Riesenberg-Karges, MD
Surgery Physician · Tucson, AZ
Margaret Riesenberg-Karges, MD is a surgery physician with a practice address in Tucson, Arizona, and NPI 1235371725, issued on Mar 30, 2009. Check the license (Arizona 52314, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Margaret Riesenberg-Karges
- Credential
- MD
- Primary taxonomy
- Surgery Physician 208600000X
- License number
- 52314 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 6879 N Oracle RD Ste 133, Tucson, AZ 85704
- Phone
- (520) 638-8311
- Enumerated
- Mar 30, 2009
- Record last updated
- Mar 5, 2025
- Fax
- (520) 638-8321
- Medicare enrollment
- Enrolled (PECOS I20160829001891); accepts Medicare assignment
- Medical or professional school
- Saint Louis University School Of Medicine, 2009
- Entity
- Type 1 · individual
8 nearest surgery physician records → All 760 in Arizona → Look up another NPI →
Verify Margaret Riesenberg-Karges in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 52314Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
37% more Medicare Part D claims than the average surgery physician in 2024
201 Medicare Part D claims for 127 beneficiaries, against an average of 147 among the 20,115 providers of this specialty who prescribed in Part D. 105 claims were for opioids.
Most prescribed
- Tramadol Hcl100 claims
- Tamsulosin Hcl18 claims
- Metronidazole13 claims
- Neomycin Sulfate13 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): 89.3 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).
Industry payments in 2024: $16.86
1 payment: food and beverage; the largest payer was Intuitive Surgical, Inc. The 17,103 providers of this specialty with any payment received $3,513.80 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.
Margaret Riesenberg-Karges among 760 surgery physician records in Arizona
Margaret Riesenberg-Karges, MD is one of 760 surgery physician records with a practice address in Arizona. 72% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 53% of them.
- NPI issued2009 · 53% of these records are older, 44% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2009 · median 2006 among the 401 with a school on file
- Record last updated2025 · 45% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208600000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Surgery Physician providers in Arizona
There are 760 surgery physician records in Arizona.
All 760 in Arizona → Every provider in Tucson → Surgery Physician nationwide →
The 8 surgery physician records with the nearest ZIP codes
- Paul Nakazato, MDTucson, AZ 857041871583534
- David Anaise, MDTucson, AZ 857011427305770
- Richard Dale, MDTucson, AZ 857101962411165
- James Herde, M.D.Tucson, AZ 857101316940067
- Sitara Kommareddi, MDTucson, AZ 857101841236833
- Michael Lavor, MDTucson, AZ 857101063440972
- Nagin Patel, MDTucson, AZ 857101215030226
- Kenneth Johnson, MDTucson, AZ 857111053472332
Common questions
What is Margaret Riesenberg-Karges, MD's NPI number?
Margaret Riesenberg-Karges, MD's National Provider Identifier (NPI) is 1235371725, issued on Mar 30, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Margaret Riesenberg-Karges, MD located?
The NPPES record lists a practice address at 6879 N Oracle RD Ste 133, Tucson, AZ, 85704. Phone: (520) 638-8311. Providers update this record themselves, so call before visiting.
How can I verify Margaret Riesenberg-Karges, MD's license?
NPPES lists Arizona license number 52314, as entered by the provider. Search the Arizona Medical Board at https://www.azmd.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Margaret Riesenberg-Karges, MD prescribe under Medicare Part D?
In 2024, Margaret Riesenberg-Karges, MD had 201 Medicare Part D claims for 127 beneficiaries; the average among surgery physician prescribers was 147. Part D covers Medicare prescriptions only.
What is Margaret Riesenberg-Karges, MD's MIPS final score?
The 2023 MIPS final score is 89.3 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.