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DR. DIANNA YAN M.D.
NPI 1710928411
Obstetrics & Gynecology in Gaithersburg, MD

Active since June 10, 2006PECOS Enrolled
8909 SHADY GROVE CT, GAITHERSBURG, MD 20877(301) 963-0900(301) 963-9694 Get Directions Write a Review

NPPES record last updated: July 16, 2009. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Dianna Yan M.d. NPPES

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

DR. DIANNA YAN M.D. (NPI 1710928411) is an individual obstetrics & gynecology provider in Gaithersburg, Maryland, licensed in Maryland (D43385) and active in the NPI registry since June 2006. She is enrolled in Medicare PECOS and is a graduate of Texas Tech University Health Science Center School Of Medicine (1988).

NPPES Registry Identity

NPI1710928411
Entity TypeIndividualFemale
Primary Taxonomy207V00000X
Provider Legal NameDR. DIANNA YANCredential: M.D.
Location Address8909 SHADY GROVE CTGaithersburg, MD 20877-1308
Mailing Address8909 Shady Grove CtGaithersburg, MD 20877-1308 · (301) 963-0900 · Fax (301) 963-9694
Phone(301) 963-0900
Fax(301) 963-9694
Sole ProprietorNo
Medical School CMSTexas Tech University Health Science Center School Of MedicineGraduated 1988
Enumeration DateJune 10, 2006
Last NPPES UpdateJuly 16, 2009
✔ NPI 1710928411 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians
Taxonomy Code207V00000X
License✔ Licensed in MD · D43385
Definition
An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.
8909 SHADY GROVE CT, Gaithersburg, MD 20877
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Other Identifiers 3

Medicare ID-Type Unspecified133049MD
Medicaid755631400MD
Medicare UPINF39928MD

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Dianna Yan M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID3274686910
PECOS Enrollment IDI20090804000007
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 Dianna Yan reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Dianna Yan MD PC
Same address
Specialist
8909 SHADY GROVE CT
Gaithersburg, MD 20877
  • Reassigned Medicare billing, District of Columbia enrollment
NPI 1558599498 (301) 963-0900

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 3

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.

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
128 services41 patients
Cervical or vaginal cancer screening; pelvic and clinical breast examination G0101
This procedure involves checking for health issues in the lower abdomen and chest area. It helps identify early signs of certain conditions, increasing the chance for successful treatment. It's a routine check-up that's important for maintaining good health.
27 services27 patients
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204
This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.
13 services13 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 20877 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
$147.85 typical visit price
range $65.18 – $194.86
Typical copayment $36.96 (range $16.29 – $48.71)
Most-billed visit code 99204
Established Patient
$80.66 typical visit price
range $21.40 – $158.88
Typical copayment $20.16 (range $5.35 – $39.72)
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

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

DIANNA YAN MD PC
Specialist
8909 SHADY GROVE CT
GAITHERSBURG, MD 20877
Montgomery County (301) 963-0900

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 Dianna Yan's NPI number?

The NPI number for Dianna Yan is 1710928411. It was assigned to this individual provider in the NPPES registry on June 10, 2006.

Where is Dianna Yan located?

Dianna Yan practices at 8909 Shady Grove Ct, Gaithersburg, MD 20877. The listed phone number is (301) 963-0900.

What is Dianna Yan's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Is Dianna Yan enrolled in Medicare?

Yes. Dianna Yan is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Dianna Yan's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Dianna Yan reassigns Medicare benefits to Dianna Yan MD PC (Gaithersburg, MD). 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 Dianna Yan'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 Dianna Yan was last updated on July 16, 2009. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.