NATHANIEL JAMES STEWART M.D.
NPI 1225064017
Orthopaedic Surgery in Altoona, WI

Q: What is Nathaniel Stewart's NPI number?

The NPI number for Nathaniel Stewart is 1225064017. It was assigned to this individual provider in the NPPES registry on June 23, 2006.

Q: What is Nathaniel Stewart's specialty?

The primary specialty registered for this NPI is Orthopaedic Surgery with taxonomy code 207X00000X.

Q: When was this NPI record last updated?

The NPPES record for Nathaniel Stewart was last updated on June 5, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.

Active since June 23, 2006PECOS EnrolledAccepts Medicare Assignment

10.77/100

CMS Quality Rating

1200 OAKLEAF WAY STE A, ALTOONA, WI 54720(715) 832-1400(715) 832-4187 Get Directions Write a Review

NPPES record last updated: June 5, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Jun 5, 2026, Dec 17, 2021 (2 updates tracked since 2021).

On this page

About Nathaniel James Stewart M.d. NPPES

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

NATHANIEL JAMES STEWART M.D. (NPI 1225064017) is an individual orthopaedic surgery provider in Altoona, Wisconsin, licensed in Wisconsin (39520) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS, is affiliated with Aspirus Wausau Hospital, and is a graduate of University Of Minnesota Medical School (1992).

NPPES Registry Identity

NPI1225064017

Entity TypeIndividualMale

Primary Taxonomy207X00000X

Provider Legal NameNATHANIEL JAMES STEWARTCredential: M.D.

Location Address1200 OAKLEAF WAY STE AAltoona, WI 54720-2217

Mailing Address1200 Oakleaf Way Ste AAltoona, WI 54720-2217 · (715) 832-1400 · Fax (715) 832-4187

Phone(715) 832-1400

Fax(715) 832-4187

Sole ProprietorNo

Medical School CMSUniversity Of Minnesota Medical SchoolGraduated 1992

Enumeration DateJune 23, 2006

Last NPPES UpdateJune 5, 20262 updates tracked since enumeration

NPPES CertifiedJune 5, 2026

✔ NPI 1225064017 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOrthopaedic SurgeryAllopathic & Osteopathic Physicians

Taxonomy Code207X00000X

License✔ Licensed in WI · 39520

Definition

An orthopaedic surgeon is trained in the preservation, investigation and restoration of the form and function of the extremities, spine and associated structures by medical, surgical and physical means. An orthopaedic surgeon is involved with the care of patients whose musculoskeletal problems include congenital deformities, trauma, infections, tumors, metabolic disturbances of the musculoskeletal system, deformities, injuries and degenerative diseases of the spine, hands, feet, knee, hip, shoulder and elbow in children and adults. An orthopaedic surgeon is also concerned with primary and secondary muscular problems and the effects of central or peripheral nervous system lesions of the musculoskeletal system.

1200 OAKLEAF WAY STE A, Altoona, WI 54720

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Other Identifiers 9

Medicaid32400600WI

Other85410WI · Security Health Plan

Other378L4STWI · Bcbs Mn

Other09 01123WI · Medica/selectcare Ec

Other1930920WI · United Healthcare

Other208036400WI · Owcp

OtherP00136555WI · Railroad Medicare

Other09-01124WI · Medica/selectcare Cf

Other2110231WI · First Health

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield, HealthPartners, Medica and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Nathaniel James Stewart M.d. 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 ID5799688099

PECOS Enrollment IDI20040619000068

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.

Areas of Expertise CMS Part B claims 20

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.

Injection, triamcinolone acetonide, not otherwise specified, 10 mg J3301

Triamcinolone acetonide is a medication used to reduce inflammation in the body. It's given as a 10 mg injection for conditions like allergies, arthritis, or skin problems. The injection helps to decrease swelling, redness, and itching.

532 services59 patients

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.

282 services202 patients

X-ray of hip, 2-3 views 73502

An X-ray of the hip with 2-3 views is a non-invasive imaging test. It uses a small amount of radiation to produce pictures of the hip joint. These images help in diagnosing conditions like fractures, arthritis, or other abnormalities. The process is quick and painless.

230 services178 patients

X-ray of knee, 3 views 73562

An X-ray of the knee, 3 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of the knee from three different angles. This helps medical professionals to diagnose and monitor conditions like arthritis, fractures, or infections. The process is quick and painless.

189 services133 patients

Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more 99212

This is a routine check-up for patients who have previously seen the doctor. During this 10-19 minute visit, the doctor will review your health status, discuss any concerns, and manage ongoing treatments or medications. It's a chance to ensure your health is on track.

98 services82 patients

Aspiration and/or injection of fluid from large joint 20610

This procedure involves using a needle to remove (aspiration) or introduce (injection) fluid into a large joint like the knee or hip. It can help diagnose conditions, relieve discomfort, or deliver medication directly to the joint.

87 services74 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.

85 services85 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.

74 services70 patients

X-ray of lower and sacral spine, 2-3 views 72100

An X-ray of the lower and sacral spine involves capturing images of your lower back area, including the tailbone. This procedure helps in identifying problems like fractures, infections, or deformities. 2-3 different angle views provide a comprehensive picture.

55 services55 patients

Mri scan of leg joint without contrast 73721

An MRI scan of your leg joint is a non-invasive procedure that uses magnetic fields and radio waves to create detailed images of the structures within your leg. This helps doctors diagnose or monitor conditions without using contrast dye.

55 services51 patients

Replacement of thigh bone and hip joint with prosthesis 27130

This procedure, known as hip arthroplasty, involves replacing your damaged thigh bone and hip joint with artificial parts, called a prosthesis. It helps relieve pain, improve mobility, and enhance your quality of life.

50 services49 patients

Computer-assisted, fluoroscopic image-guided musculoskeletal surgical navigational orthopedic operation 0054T

This is a high-tech procedure where a computer aids in navigating surgical instruments, using real-time images. It enhances precision during orthopedic operations, helping to protect surrounding tissues and improve outcomes. It's like GPS for surgery!

38 services37 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.

37 services37 patients

Ct scan of leg without contrast 73700

A CT scan of the leg is a non-invasive imaging test that uses X-rays to capture detailed images of your leg's bones, muscles, and blood vessels. It doesn't use contrast dye and doesn't cause any pain. It helps in diagnosing injuries or diseases.

31 services27 patients

Mri scan of lower spinal canal without contrast 72148

An MRI scan of the lower spinal canal without contrast is a non-invasive imaging test. It uses a magnetic field and radio waves to produce detailed images of your lower spine. This helps identify issues like disc problems, tumors, or nerve conditions. No dye is used.

29 services29 patients

Replacement of knee joint, both sides of knee 27447

A bilateral knee joint replacement is a procedure where the damaged parts of both your knee joints are replaced with artificial parts. It aims to relieve pain and improve mobility. The process involves a surgical operation under anesthesia.

27 services24 patients

Musculoskeletal surgical navigational orthopedic operation using imaging guidance 0055T

This is a precise orthopedic surgery using advanced imaging technology. It helps the surgeon navigate through your musculoskeletal system (bones, muscles, and joints) accurately. This method reduces the risk of damage to nearby areas and aids in a more successful operation.

20 services19 patients

X-ray of pelvis, 1-2 views 72170

An X-ray of the pelvis, 1-2 views, is a quick and painless imaging test. It uses a small amount of radiation to produce images of the lower part of your torso. These images help to detect any abnormalities or injuries in your hip bones and surrounding structures.

20 services17 patients

X-ray of both hips, 3-4 views 73522

An X-ray of both hips with 3-4 views is a safe imaging procedure. It involves capturing multiple pictures of your hip joints from different angles. This helps in diagnosing conditions like arthritis or fractures. You'll need to stay still during the process for clear images.

19 services19 patients

X-ray of both hips, minimum of 5 views 73523

An X-ray of both hips with a minimum of 5 views is a non-invasive imaging test. It uses a small amount of radiation to produce images of the hip joints from different angles. This aids in diagnosing conditions such as fractures, arthritis, or other hip abnormalities.

17 services17 patients

Hospital Affiliations CMS Care Compare 5

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Aspirus Wausau Hospital

Acute Care Hospitals · Wausau, WI

4/5 CMS rating

OwnershipProprietary

CMS Certification Number520030

Location333 Pine Ridge BlvdWausau, WI 54401 · Marathon County

Emergency services Birthing friendly

Oakleaf Surgical Hospital

Acute Care Hospitals · Altoona, WI

OwnershipPhysician

CMS Certification Number520196

Location1000 Oakleaf WayAltoona, WI 54720 · Eau Claire County

Aspirus Stanley Hospital

Critical Access Hospitals · Stanley, WI

OwnershipVoluntary non-profit - Private

CMS Certification Number521311

Location1120 Pine StStanley, WI 54768 · Chippewa County

Emergency services

Aspirus Medford Hospital & Clinics, Inc

Critical Access Hospitals · Medford, WI

OwnershipVoluntary non-profit - Private

CMS Certification Number521324

Location135 S Gibson StMedford, WI 54451 · Taylor County

Emergency services Birthing friendly

Cumberland Memorial Hospital

Critical Access Hospitals · Cumberland, WI

OwnershipVoluntary non-profit - Other

CMS Certification Number521353

Location1705 16th AveCumberland, WI 54829 · Barron County

Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 54720 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

$82.92 typical visit price

range $53.90 – $163.24

Typical copayment $20.73 (range $13.47 – $40.81)

Most-billed visit code 99203

Established Patient

$67.37 typical visit price

range $17.40 – $133.76

Typical copayment $16.84 (range $4.35 – $33.44)

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.

10.77/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Individually scored

Quality

Promoting Interoperability

Improvement Activities

Cost

35.92

Referred Medical Equipment & Supplies CMS DME claims 2

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Continuous passive motion exercise device for use on knee only E0935

DME-Other DME · category DE000N

1 supplier20 claims377 services$19.06 avg. paid by Medicare

Standard wheelchair K0001

DME-Wheelchairs · category DD000N

3 suppliers11 claims13 services$30.80 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 20

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

NATHAN HOADLEY HARRIS M.D.

Orthopaedic Surgery