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RUI-MIN DIANA MAO MD
NPI 1235796673
Surgery in Portland, OR

Active since May 21, 2019PECOS Enrolled
3181 SW SAM JACKSON PARK RD, PORTLAND, OR 97239(503) 494-8311 Get Directions Write a Review

NPPES record last updated: June 13, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Rui-min Diana Mao Md NPPES

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

RUI-MIN DIANA MAO MD (NPI 1235796673) is an individual surgery provider in Portland, Oregon, licensed in Oregon (BP10066743) and active in the NPI registry since May 2019. She is enrolled in Medicare PECOS and is a graduate of University Of Texas Southwestern Medical School At Dallas (2019).

NPPES Registry Identity

NPI1235796673
Entity TypeIndividualFemale
Primary Taxonomy208600000X
Provider Legal NameRUI-MIN DIANA MAOCredential: MD
Location Address3181 SW SAM JACKSON PARK RDPortland, OR 97239-3098
Mailing Address3181 Sw Sam Jackson Park RdPortland, OR 97239-3098
Phone(503) 494-8311
Sole ProprietorNo
Medical School CMSUniversity Of Texas Southwestern Medical School At DallasGraduated 2019
Enumeration DateMay 21, 2019
Last NPPES UpdateJune 13, 2026
NPPES CertifiedJune 13, 2026
✔ NPI 1235796673 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySurgeryAllopathic & Osteopathic Physicians
Taxonomy Code208600000X
License✔ Licensed in OR · BP10066743
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.
3181 SW SAM JACKSON PARK RD, 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)

Rui-min Diana Mao Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID2567797764
PECOS Enrollment IDI20260619002004
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 Reassignment

Medicare enrollment records show Rui-min Mao reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

University Professional Services
Same address
General Practice
3181 SW SAM JACKSON PARK RD
Portland, OR 97239
  • Reassigned Medicare billing, Oregon enrollment
  • 2,212 clinicians in this Medicare group
NPI 1376709535 (503) 494-8311

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
$73.28 typical visit price
range $19.32 – $144.79
Typical copayment $18.32 (range $4.83 – $36.19)
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.

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.

DONALD RICHARD SULLIVAN MD
Internal Medicine (Pulmonary Disease)
3181 SW SAM JACKSON PARK RD, UHN67
PORTLAND, OR 97239
Multnomah County (503) 494-6949
MRS. ANJALEE NIX ROWE NP
Nurse Practitioner (Acute Care)
3181 SW SAM JACKSON PARK RD
PORTLAND, OR 97239
Multnomah County (503) 494-3988
REEM HASAN MD
Internal Medicine
3181 SW SAM JACKSON PARK RD, PPV 350
PORTLAND, OR 97239
Multnomah County (503) 494-8562
DR. AMANDA D BALL PSY.D
Psychologist (Clinical)
3181 SW SAM JACKSON PARK RD
PORTLAND, OR 97239
Multnomah County (503) 494-6176
SUNSHINE WELSCH LMT
Massage Therapist
3181 SW SAM JACKSON PARK RD, 7D19
PORTLAND, OR 97239
Multnomah County (503) 494-8349
DR. ROBERT GENE MEALER M.D., PH.D.
Psychiatry & Neurology (Psychiatry)
3181 SW SAM JACKSON PARK RD
PORTLAND, OR 97239
Multnomah County (503) 494-6176
GREGORY HALL MD
Radiology (Diagnostic Radiology)
3181 SW SAM JACKSON PARK RD
PORTLAND, OR 97239
Multnomah County (503) 418-0990
DR. BURHAN AHMED MIAN MD
Student in an Organized Health Care Education/Training Program
3181 SW SAM JACKSON PARK RD
PORTLAND, OR 97239
Multnomah County (503) 494-8311

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 Rui-min Mao's NPI number?

The NPI number for Rui-min Mao is 1235796673. It was assigned to this individual provider in the NPPES registry on May 21, 2019.

Where is Rui-min Mao located?

Rui-min Mao practices at 3181 SW Sam Jackson Park Rd, Portland, OR 97239. The listed phone number is (503) 494-8311.

What is Rui-min Mao's specialty?

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

Is Rui-min Mao enrolled in Medicare?

Yes. Rui-min Mao is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Rui-min Mao's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Rui-min Mao reassigns Medicare benefits to University Professional Services (Portland, OR). The 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 Rui-min Mao'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 Rui-min Mao was last updated on June 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.