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ILSE A LARSON M.D.
NPI 1700050333
Pediatrics in Portland, OR

Active since April 15, 2008PECOS Enrolled
3181 SW SAM JACKSON PARK ROAD, PORTLAND, OR 97239(503) 494-6513(503) 494-1542 Get Directions Write a Review

NPPES record last updated: January 21, 2020. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Ilse A Larson M.d. NPPES

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

ILSE A LARSON M.D. (NPI 1700050333) is an individual pediatrics provider in Portland, Oregon, licensed in California (A103087) and active in the NPI registry since April 2008. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1700050333
Entity TypeIndividualFemale
Primary Taxonomy208000000X
Provider Legal NameILSE A LARSONCredential: M.D.
Location Address3181 SW SAM JACKSON PARK ROADPortland, OR 97239-3098
Mailing Address2330 Post St, Ste 320San Francisco, CA 94115-3466
Phone(503) 494-6513
Fax(503) 494-1542
Sole ProprietorNo
Enumeration DateApril 15, 2008
Last NPPES UpdateJanuary 21, 2020
✔ NPI 1700050333 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians
Taxonomy Code208000000X
Licenses✔ Licensed in CA · A103087✔ Licensed in OR · MD167663
Definition
A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.
3181 SW SAM JACKSON PARK ROAD, Portland, OR 97239
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Ilse A Larson M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Ilse Larson reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Ucsf Medical Group Business Services
534 mi
Internal Medicine
400 PARNASSUS AVE
San Francisco, CA 94122
  • Reassigned Medicare billing, California enrollment
  • 5,544 clinicians in this Medicare group
NPI 1477624104 (415) 353-2808
University Of California San Francisco
534 mi
Internal Medicine
400 PARNASSUS AVE
San Francisco, CA 94143
  • Reassigned Medicare billing, California enrollment
  • 5,645 clinicians in this Medicare group
NPI 1164512851 (415) 476-1000
Ucsf Pediatrics Associates
534 mi
Pediatrics
505 PARNASSUS AVE
San Francisco, CA 94143
  • Reassigned Medicare billing, California enrollment
  • 1,159 clinicians in this Medicare group
NPI 1376614016 (415) 353-2000

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 97239 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
$90.51 typical visit price
range $58.99 – $176.88
Typical copayment $22.62 (range $14.74 – $44.22)
Most-billed visit code 99203
Established Patient
$103.51 typical visit price
range $19.32 – $144.79
Typical copayment $25.87 (range $4.83 – $36.19)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

MATTHEW JUDGE M.D.
Student in an Organized Health Care Education/Training Program
3181 SW SAM JACKSON PARK ROAD, OREGON HEALTH & SCIENCE UNIVERSITY
PORTLAND, OR 97239
Multnomah County (503) 494-8144
MEGAN FURNARI M.D., M.S.
Pediatrics (Neonatal-Perinatal Medicine)
3181 SW SAM JACKSON PARK ROAD
PORTLAND, OR 97239
Multnomah County (503) 494-8211
MS. CHERYL DAWN MELZER PT
Physical Therapist
3181 SW SAM JACKSON PARK ROAD
PORTLAND, OR 97239
Multnomah County (503) 494-4998
NATHAN RICHARD SCHOENECK MD
Student in an Organized Health Care Education/Training Program
3181 SW SAM JACKSON PARK ROAD, OHSU,
PORTLAND, OR 97239
Multnomah County (503) 494-8211
EMILY LAUREN PATON
Student in an Organized Health Care Education/Training Program
3181 SW SAM JACKSON PARK ROAD
PORTLAND, OR 97239
Multnomah County (503) 494-8211
DR. LAURA ANN RYAN M.D.
Emergency Medicine
3181 SW SAM JACKSON PARK ROAD, CB 550
PORTLAND, OR 97239
Multnomah County (503) 494-2595
DR. JENNIFER LYNN FILE MCCALL DO
Pediatrics
3181 SW SAM JACKSON PARK ROAD
PORTLAND, OR 97239
Multnomah County (503) 494-1303
RYAN WALLENBERG M.D.
Student in an Organized Health Care Education/Training Program
3181 SW SAM JACKSON PARK ROAD
PORTLAND, OR 97239
Multnomah County (503) 494-8211

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 Ilse Larson's NPI number?

The NPI number for Ilse Larson is 1700050333. It was assigned to this individual provider in the NPPES registry on April 15, 2008.

Where is Ilse Larson located?

Ilse Larson practices at 3181 SW Sam Jackson Park Road, Portland, OR 97239. The listed phone number is (503) 494-6513.

What is Ilse Larson's specialty?

The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.

Is Ilse Larson enrolled in Medicare?

Yes. Ilse Larson is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Ilse Larson's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ilse Larson reassigns Medicare benefits to 3 organizations: Ucsf Medical Group Business Services (San Francisco, CA), University Of California San Francisco (San Francisco, CA) and Ucsf Pediatrics Associates (San Francisco, CA). 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 Ilse Larson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Ilse Larson was last updated on January 21, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years 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.