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MARGARET RIESENBERG-KARGES MD
NPI 1235371725
Surgery in Tucson, AZ

Active since March 30, 2009PECOS EnrolledAccepts Medicare Assignment
82.37/100
CMS Quality Rating
6879 N ORACLE RD STE 133, TUCSON, AZ 85704(520) 638-8311(520) 638-8321 Get Directions Write a Review

NPPES record last updated: March 5, 2025. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Mar 5, 2025, Mar 19, 2021, Sep 28, 2020 and 2 more (5 updates tracked since 2016).

About Margaret Riesenberg-karges Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MARGARET RIESENBERG-KARGES MD (NPI 1235371725) is an individual surgery provider in Tucson, Arizona, licensed in Arizona (52314) and active in the NPI registry since March 2009. She is enrolled in Medicare PECOS and is a graduate of Saint Louis University School Of Medicine (2009).

NPPES Registry Identity

NPI1235371725
Entity TypeIndividualFemale
Primary Taxonomy208600000X
Provider Legal NameMARGARET RIESENBERG-KARGESCredential: MD
Location Address6879 N ORACLE RD STE 133Tucson, AZ 85704-4285
Mailing AddressPo Box 43100Tucson, AZ 85733-3100 · (520) 638-8311 · Fax (520) 638-8321
Phone(520) 638-8311
Fax(520) 638-8321
Sole ProprietorNo
Medical School CMSSaint Louis University School Of MedicineGraduated 2009
Enumeration DateMarch 30, 2009
Last NPPES UpdateMarch 5, 20255 updates tracked since enumeration
NPPES CertifiedMarch 5, 2025
✔ NPI 1235371725 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySurgeryAllopathic & Osteopathic Physicians
Taxonomy Code208600000X
License✔ Licensed in AZ · 52314
Definition
A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.
6879 N ORACLE RD STE 133, Tucson, AZ 85704
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Other Names 1

Other Name (5)Margaret Karges Md

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross Blue Shield of Arizona, UnitedHealthcare.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Margaret Riesenberg-karges Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID5799900874
PECOS Enrollment IDI20160829001891
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

3

Medicare enrollment records show Margaret Riesenberg-karges reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Sonoran Sky Surgical Plc
Same address
Surgery
6879 N ORACLE RD STE 133
Tucson, AZ 85704
  • Reassigned Medicare billing, Arizona enrollment
NPI 1992410989 (520) 638-8311
Northwest Allied Physicians LLC
2.1 mi
General Practice
6060 N FOUNTAIN PLAZA DR STE 270
Tucson, AZ 85704
  • Reassigned Medicare billing, Arizona enrollment
  • 296 clinicians in this Medicare group
NPI 1003833179 (520) 229-2578
Sierra Vista Regional Health Center Medical Group LLC
69 mi
Family Medicine
5750 E HIGHWAY 90, SUITE 200
Sierra Vista, AZ 85635
  • Reassigned Medicare billing, Arizona enrollment
  • 128 clinicians in this Medicare group
NPI 1043575483 (520) 263-3979

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 11

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
64 services41 patients
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204
This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.
57 services57 patients
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203
This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.
38 services38 patients
Repair of groin hernia using an endoscope 49650
This procedure involves the use of an endoscope, a thin tube with a camera, to repair a hernia in the groin area. The surgeon makes small incisions, inserts the endoscope, and uses special tools to fix the hernia. This minimally invasive technique often results in quicker recovery times.
30 services30 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
28 services23 patients
New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205
This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.
22 services22 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 85704 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$85.89 typical visit price
range $55.44 – $168.60
Typical copayment $21.47 (range $13.86 – $42.15)
Most-billed visit code 99203
Established Patient
$69.24 typical visit price
range $17.72 – $137.41
Typical copayment $17.31 (range $4.43 – $34.35)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

82.37/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality83.57
Promoting Interoperability100
Improvement Activities40
Cost57.66

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

SONORAN SKY SURGICAL PLC
Surgery
6879 N ORACLE RD STE 133
TUCSON, AZ 85704
Pima County (520) 638-8311

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Margaret Riesenberg-karges's NPI number?

The NPI number for Margaret Riesenberg-karges is 1235371725. It was assigned to this individual provider in the NPPES registry on March 30, 2009. The provider is also known as Margaret Karges MD.

Where is Margaret Riesenberg-karges located?

Margaret Riesenberg-karges practices at 6879 N Oracle Rd Ste 133, Tucson, AZ 85704. The listed phone number is (520) 638-8311.

What is Margaret Riesenberg-karges's specialty?

The primary specialty registered for this NPI is Surgery with taxonomy code 208600000X.

Is Margaret Riesenberg-karges enrolled in Medicare?

Yes. Margaret Riesenberg-karges is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Margaret Riesenberg-karges's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Margaret Riesenberg-karges reassigns Medicare benefits to 3 organizations: Sonoran Sky Surgical Plc (Tucson, AZ), Northwest Allied Physicians LLC (Tucson, AZ) and Sierra Vista Regional Health Center Medical Group LLC (Sierra Vista, AZ). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Margaret Riesenberg-karges's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Margaret Riesenberg-karges accept?

Health plans from Blue Cross Blue Shield of Arizona and UnitedHealthcare list Margaret Riesenberg-karges as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Margaret Riesenberg-karges was last updated on March 5, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.