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

SIYUAN CAO
NPI 1871958223
Internal Medicine in Boston, MA

Q: What is Siyuan Cao's NPI number?

The NPI number for Siyuan Cao is 1871958223. It was assigned to this individual provider in the NPPES registry on December 29, 2015.

Q: What is Siyuan Cao's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Q: When was this NPI record last updated?

The NPPES record for Siyuan Cao was last updated on August 18, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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 December 29, 2015PECOS Enrolled

77 WARREN ST, BOSTON, MA 02135(617) 789-2545 Get Directions Write a Review

NPPES record last updated: August 18, 2026. Verified against the NPPES registry weekly; last sync: August 30, 2026.

Record update history: Aug 18, 2026, Jun 30, 2021, May 16, 2018 and 1 more (4 updates tracked since 2015).

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About Siyuan Cao NPPES

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

SIYUAN CAO (NPI 1871958223) is an individual internal medicine provider in Boston, Massachusetts, licensed in New York (308878) and active in the NPI registry since December 2015. She is enrolled in Medicare PECOS, is affiliated with Boston Medical Center, and is a graduate of Johns Hopkins University School Of Medicine (2018).

NPPES Registry Identity

NPI1871958223

Entity TypeIndividualFemale

Primary Taxonomy207R00000X

Provider Legal NameSIYUAN CAO

Location Address77 WARREN STBoston, MA 02135-3601

Mailing Address77 Warren StBoston, MA 02135-3601 · (617) 789-2545

Phone(617) 789-2545

Sole ProprietorNo

Medical School CMSJohns Hopkins University School Of MedicineGraduated 2018

Enumeration DateDecember 29, 2015

Last NPPES UpdateAugust 18, 20264 updates tracked since enumeration

NPPES CertifiedAugust 18, 2026

✔ NPI 1871958223 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in NY · 308878

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Also ListedInternal Medicine · Pulmonary DiseaseTaxonomy 207RP1001X · License 1023421 (MA)

77 WARREN ST, Boston, MA 02135

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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield.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

Siyuan Cao 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 ID42559882

PECOS Enrollment IDI20250819000000

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.

Hospital Affiliations CMS Care Compare 3

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

Boston Medical Center

Acute Care Hospitals · Boston, MA

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number220031

Location1 Boston Medical Center PlaceBoston, MA 02118 · Suffolk County

Emergency services Birthing friendly

St Elizabeth's Medical Center

Acute Care Hospitals · Brighton, MA

2/5 CMS rating

OwnershipProprietary

CMS Certification Number220036

Location736 Cambridge StreetBrighton, MA 02135 · Suffolk County

Emergency services Birthing friendly

Good Samaritan Medical Center

Acute Care Hospitals · Brockton, MA

2/5 CMS rating

OwnershipProprietary

CMS Certification Number220111

Location235 North Pearl StreetBrockton, MA 02301 · Plymouth County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 02135 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

$144.11 typical visit price

range $63.72 – $189.86

Typical copayment $36.02 (range $15.93 – $47.46)

Most-billed visit code 99204

Established Patient

$111.18 typical visit price

range $21.07 – $155.29

Typical copayment $27.79 (range $5.26 – $38.82)

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.

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.

Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390

DME-Oxygen and Supplies · category DC002N

1 supplier27 claims27 services$61.46 avg. paid by Medicare

Portable gaseous oxygen system, rental; home compressor used to fill portable oxygen cylinders; includes portable containers, regulator, flowmeter, humidifier, cannula or mask, and tubing K0738

DME-Oxygen and Supplies · category DC000N

1 supplier19 claims19 services$34.76 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.

CANDACE LOUGHLIN

Registered Nurse