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

DR. MARK JOSHUA CHANG DO
NPI 1861954182
Internal Medicine - Hematology & Oncology in Upland, CA

Q: What is Mark Chang's NPI number?

The NPI number for Mark Chang is 1861954182. It was assigned to this individual provider in the NPPES registry on April 4, 2019.

Q: What is Mark Chang's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.

Q: When was this NPI record last updated?

The NPPES record for Mark Chang was last updated on July 8, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 43 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 April 04, 2019PECOS Enrolled

1100 SAN BERNARDINO RD STE 1100, UPLAND, CA 91786(909) 949-2242(909) 981-5783 Get Directions Write a Review

NPPES record last updated: July 8, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Jul 8, 2026, Jan 13, 2026, Jun 5, 2023 and 1 more (4 updates tracked since 2019).

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About Dr. Mark Joshua Chang Do NPPES

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

DR. MARK JOSHUA CHANG DO (NPI 1861954182) is an individual hematology & oncology provider in Upland, California, licensed in California (20A24887) and active in the NPI registry since April 2019. He is enrolled in Medicare PECOS and is a graduate of Other (2019).

NPPES Registry Identity

NPI1861954182

Entity TypeIndividualMale

Primary Taxonomy207RH0003X

Provider Legal NameDR. MARK JOSHUA CHANGCredential: DO

Location Address1100 SAN BERNARDINO RD STE 1100Upland, CA 91786-4952

Mailing AddressPo Box 512185Los Angeles, CA 90051-0185

Phone(909) 949-2242

Fax(909) 981-5783

Sole ProprietorYes

Medical School CMSOtherGraduated 2019

Enumeration DateApril 4, 2019

Last NPPES UpdateJuly 8, 20264 updates tracked since enumeration

NPPES CertifiedJuly 8, 2026

✔ NPI 1861954182 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal Medicine · Hematology & OncologyAllopathic & Osteopathic Physicians

Taxonomy Code207RH0003X

License✔ Licensed in CA · 20A24887

Definition

An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.

Also ListedInternal MedicineTaxonomy 207R00000X · License DO3131 (NV)

Also ListedInternal Medicine · Medical OncologyTaxonomy 207RX0202X · License 20A24887 (CA)

1100 SAN BERNARDINO RD STE 1100, Upland, CA 91786

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Other Identifiers 1

OtherDO3131NV · Nv Medical Board Of Osteopathic Medicine

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Mark Joshua Chang Do is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID5294062634

PECOS Enrollment IDI20260423000630

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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 91786 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

$179.42 typical visit price

range $59.60 – $179.42

Typical copayment $44.85 (range $14.90 – $44.85)

Most-billed visit code 99205

Established Patient

$104.64 typical visit price

range $19.37 – $146.42

Typical copayment $26.16 (range $4.84 – $36.60)

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 13

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

MS. GENESIS IBARRA LCSW

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