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DR. YUNN-YI CHEN MD
NPI 1841245966
Pathology - Anatomic Pathology & Clinical Pathology in San Francisco, CA

Active since May 24, 2006PECOS EnrolledAccepts Medicare Assignment
74.46/100
CMS Quality Rating
505 PARNASSUS AVE, SAN FRANCISCO, CA 94143(415) 353-1102(415) 353-1102 Get Directions Write a Review

NPPES record last updated: June 5, 2008. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Dr. Yunn-yi Chen Md NPPES

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

DR. YUNN-YI CHEN MD (NPI 1841245966) is an individual anatomic pathology & clinical pathology provider in San Francisco, California, licensed in California (A65410) and active in the NPI registry since May 2006. She is enrolled in Medicare PECOS and is a graduate of Other (1985).

NPPES Registry Identity

NPI1841245966
Entity TypeIndividualFemale
Primary Taxonomy207ZP0102X
Provider Legal NameDR. YUNN-YI CHENCredential: MD
Location Address505 PARNASSUS AVESan Francisco, CA 94143-2204
Mailing Address1635 Divisadero Street, Suite 625, Box 1821San Francisco, CA 94143-0001
Phone(415) 353-1102
Fax(415) 353-1102
Sole ProprietorNo
Medical School CMSOtherGraduated 1985
Enumeration DateMay 24, 2006
Last NPPES UpdateJune 5, 2008
✔ NPI 1841245966 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPathology · Anatomic Pathology & Clinical PathologyAllopathic & Osteopathic Physicians
Taxonomy Code207ZP0102X
License✔ Licensed in CA · A65410
Definition
A pathologist deals with the causes and nature of disease and contributes to diagnosis, prognosis and treatment through knowledge gained by the laboratory application of the biologic, chemical and physical sciences. A pathologist uses information gathered from the microscopic examination of tissue specimens, cells and body fluids, and from clinical laboratory tests on body fluids and secretions for the diagnosis, exclusion and monitoring of disease.
505 PARNASSUS AVE, San Francisco, CA 94143
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Other Identifiers 3

Medicare UPING97713CA
Medicare PIN00A654100CA
Medicaid00A654100CA

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

Dr. Yunn-yi Chen Md 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 ID1759466881
PECOS Enrollment IDI20080312000763
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.

Areas of Expertise CMS Part B claims 9

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.

Microscopic genetic analysis of tumor, manual 88360
Microscopic genetic analysis of a tumor involves examining your tumor's genes under a microscope. This helps identify specific genetic changes in the tumor cells. This information can aid in diagnosing, predicting disease progression, and determining the most effective treatment options.
164 services46 patients
Pathology examination of tissue using a microscope, moderately high complexity 88307
A pathology examination of tissue with moderate complexity involves a detailed study of a small tissue sample from your body. Using a microscope, experts analyze the tissue's structure and cells to identify any abnormalities. This helps in diagnosing various health conditions accurately.
132 services35 patients
Pathology examination of tissue using a microscope, intermediate complexity 88305
A pathology examination of tissue with intermediate complexity involves studying a small sample of your body tissue under a microscope. This helps in identifying any abnormal cells or signs of disease. It's a detailed process requiring expert analysis to ensure accurate results.
126 services71 patients
Special stained specimen slides to examine tissue, each additional procedure 88341
Special stained specimen slides are used to analyze tissue in detail. In this process, extra procedures may be needed for a more thorough examination. These involve applying special stains to the tissue on slides, enhancing specific elements for closer study.
120 services47 patients
Special stained specimen slides to examine tissue, initial procedure 88342
This procedure involves the use of specially stained slides to examine tissue samples. The initial process involves obtaining a small tissue sample from your body. This sample is then placed on a slide and stained with special dyes to highlight different structures and elements. The stained slide is then examined under a microscope to help diagnose any potential health issues.
78 services62 patients
X-ray of surgical specimen 76098
An X-ray of a surgical specimen involves taking detailed images of the tissue or organ removed during surgery. This helps in examining the specimen more closely to understand the disease better. It's a safe, non-invasive procedure, providing valuable insights to your healthcare team.
38 services30 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94143 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
$153.83 typical visit price
range $69.00 – $202.35
Typical copayment $38.45 (range $17.25 – $50.58)
Most-billed visit code 99204
Established Patient
$119.48 typical visit price
range $23.44 – $166.46
Typical copayment $29.87 (range $5.86 – $41.61)
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.

74.46/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Promoting Interoperability76
Improvement Activities40
Cost46.68

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.

CATHERINE RAMSDELL NNP
Nurse Practitioner (Neonatal)
505 PARNASSUS AVE
SAN FRANCISCO, CA 94143
San Francisco County (415) 353-1000
DR. CLAUDIO ANDRES BRAVO CARRILLO M.D.
Internal Medicine (Advanced Heart Failure and Transplant Cardiology)
505 PARNASSUS AVE
SAN FRANCISCO, CA 94143
San Francisco County (415) 502-4243
MAURICIO JALIFE BUCAY M.D
Hospitalist
505 PARNASSUS AVE
SAN FRANCISCO, CA 94143
San Francisco County (415) 750-4994
EMMA B SHAK M.D.
Student in an Organized Health Care Education/Training Program
505 PARNASSUS AVE
SAN FRANCISCO, CA 94143
San Francisco County (415) 476-1528
DR. ADRIANA A.T. MARTIN M.D., PH.D.
Internal Medicine
505 PARNASSUS AVE
SAN FRANCISCO, CA 94143
San Francisco County (415) 514-7288
WILLIAM JAMES DEARDORFF
Internal Medicine (Geriatric Medicine)
505 PARNASSUS AVE, 15 LONG
SAN FRANCISCO, CA 94143
San Francisco County (415) 406-1417
KEERTHANA REDDY BANALA
Student in an Organized Health Care Education/Training Program
505 PARNASSUS AVE
SAN FRANCISCO, CA 94143
San Francisco County (415) 514-7288
ROBERT CHRISTIAN WENZ
Nurse Anesthetist, Certified Registered
505 PARNASSUS AVE
SAN FRANCISCO, CA 94143
San Francisco County (415) 353-8054

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 Yunn-yi Chen's NPI number?

The NPI number for Yunn-yi Chen is 1841245966. It was assigned to this individual provider in the NPPES registry on May 24, 2006.

Where is Yunn-yi Chen located?

Yunn-yi Chen practices at 505 Parnassus Ave, San Francisco, CA 94143. The listed phone number is (415) 353-1102.

What is Yunn-yi Chen's specialty?

The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology & Clinical Pathology, with taxonomy code 207ZP0102X.

Is Yunn-yi Chen enrolled in Medicare?

Yes. Yunn-yi Chen is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

When was this NPI record last updated?

The NPPES record for Yunn-yi Chen was last updated on June 5, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.