Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

PAK HO AU MD
NPI 1972120814
Internal Medicine - Infectious Disease in Chicago, IL

Q: What is Pak Ho Au's NPI number?

The NPI number for Pak Ho Au is 1972120814. It was assigned to this individual provider in the NPPES registry on June 26, 2020.

Q: What is Pak Ho Au's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.

Q: When was this NPI record last updated?

The NPPES record for Pak Ho Au was last updated on October 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 days 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 26, 2020PECOS Enrolled

100/100

CMS Quality Rating

676 N SAINT CLAIR ST STE 940, CHICAGO, IL 60611(312) 926-8358(312) 926-9630 Get Directions Write a Review

NPPES record last updated: October 13, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Oct 13, 2026, Jun 18, 2024, Aug 28, 2023 and 1 more (4 updates tracked since 2020).

On this page

About Pak Ho Au Md NPPES

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

PAK HO AU MD (NPI 1972120814) is an individual infectious disease provider in Chicago, Illinois, licensed in Illinois (036170835) and active in the NPI registry since June 2020. He is enrolled in Medicare PECOS and maintains a secondary practice location in Chicago.

NPPES Registry Identity

NPI1972120814

Entity TypeIndividualMale

Primary Taxonomy207RI0200X

Provider Legal NamePAK HO AUCredential: MD

Location Address676 N SAINT CLAIR ST STE 940Chicago, IL 60611-2945

Mailing Address645 N Michigan Ave Ste 900Chicago, IL 60611-2823 · (312) 926-9877

Phone(312) 926-8358

Fax(312) 926-9630

Sole ProprietorNo

Enumeration DateJune 26, 2020

Last NPPES UpdateOctober 13, 20264 updates tracked since enumeration

NPPES CertifiedOctober 13, 2026

✔ NPI 1972120814 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal Medicine · Infectious DiseaseAllopathic & Osteopathic Physicians

Taxonomy Code207RI0200X

License✔ Licensed in IL · 036170835

Definition

An internist who deals with infectious diseases of all types and in all organ systems. Conditions requiring selective use of antibiotics call for this special skill. This physician often diagnoses and treats AIDS patients and patients with fevers which have not been explained. Infectious disease specialists may also have expertise in preventive medicine and travel medicine.

Also ListedInternal MedicineTaxonomy 207R00000X · License 2023008810 (MO)

Also ListedHospitalistTaxonomy 208M00000X · License 2023008810 (MO)

676 N SAINT CLAIR ST STE 940, Chicago, IL 60611

Open in Google Maps ↗

Secondary Practice Location 1

Location 1645 N Michigan Ave Ste 900Chicago, IL 60611-2823 · Phone (312) 926-9877

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Pak Ho Au Md 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 Reassignment

Medicare enrollment records show Pak Ho Au reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Northwestern Medical Faculty Foundation

8.4 mi

Multi-Specialty

DEPT 5777
Carol Stream, IL 60122

Reassigned Medicare billing, Illinois enrollment
4,817 clinicians in this Medicare group

NPI 1346235314 (855) 694-2866

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

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.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

25 services12 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60611 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

$138.86 typical visit price

range $60.08 – $183.39

Typical copayment $34.71 (range $15.02 – $45.84)

Most-billed visit code 99204

Established Patient

$105.70 typical visit price

range $18.97 – $148.12

Typical copayment $26.42 (range $4.74 – $37.03)

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.

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.

100/100

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

Scored as part of a group practice

Promoting Interoperability

100

Improvement Activities

Other Providers at the Same Location NPPES 13

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

PHILLIP PASQUALE SANTOIEMMA M.D.

Internal Medicine (Infectious Disease)