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DR. JENNIFER SUE WAY SIANI M.D.
NPI 1649613761
Internal Medicine - Endocrinology, Diabetes & Metabolism in Westlake Village, CA

Active since April 08, 2013PECOS EnrolledAccepts Medicare Assignment
86.1/100
CMS Quality Rating
1250 LA VENTA DR, STE 101A, 207, 211, WESTLAKE VILLAGE, CA 91361(805) 494-6920(805) 494-6922 Get Directions Write a Review

NPPES record last updated: March 20, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Mar 20, 2026, Jul 19, 2024, Jul 24, 2018 and 1 more (4 updates tracked since 2018).

About Dr. Jennifer Sue Way Siani M.d. NPPES

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

DR. JENNIFER SUE WAY SIANI M.D. (NPI 1649613761) is an individual endocrinology, diabetes & metabolism provider in Westlake Village, California, licensed in California (A133595) and active in the NPI registry since April 2013. She is enrolled in Medicare PECOS and is a graduate of University Of California, Irvine, California College Of Medicine (2013).

NPPES Registry Identity

NPI1649613761
Entity TypeIndividualFemale
Primary Taxonomy207RE0101X
Provider Legal NameDR. JENNIFER SUE WAY SIANICredential: M.D.
Location Address1250 LA VENTA DR, STE 101A, 207, 211Westlake Village, CA 91361-3702
Mailing Address5767 W Century Blvd Ste 400, Suite 400Los Angeles, CA 90045-5631
Phone(805) 494-6920
Fax(805) 494-6922
Sole ProprietorNo
Medical School CMSUniversity Of California, Irvine, California College Of MedicineGraduated 2013
Enumeration DateApril 8, 2013
Last NPPES UpdateMarch 20, 20264 updates tracked since enumeration
NPPES CertifiedMarch 20, 2026
✔ NPI 1649613761 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Endocrinology, Diabetes & MetabolismAllopathic & Osteopathic Physicians
Taxonomy Code207RE0101X
License✔ Licensed in CA · A133595
Definition
An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems.
1250 LA VENTA DR, Westlake Village, CA 91361
Open in Google Maps ↗

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. Jennifer Sue Way Siani M.d. 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 ID6901152875
PECOS Enrollment IDI20180706001497
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 10

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.

Injection, romosozumab-aqqg, 1 mg J3111
Romosozumab-aqqg is a medication given by injection to treat osteoporosis in patients at high risk for fractures. It works by increasing bone mass and strength, reducing the risk of fractures.
12,810 services12 patients
Injection, denosumab, 1 mg J0897
Denosumab is a medication given via injection to strengthen your bones. It works by slowing down the cells that break down bone, improving bone density and reducing the risk of fractures. It's often used for osteoporosis treatment.
2,160 services25 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
518 services263 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.
174 services174 patients
Hemoglobin a1c level 83036
Hemoglobin A1c (HbA1c) is a test that measures your average blood sugar level over the past 2-3 months. It's used to monitor how well diabetes is being controlled. High levels may indicate that your diabetes treatment plan needs adjustment.
143 services99 patients
Injection of drug or substance under skin or into muscle 96372
This procedure involves administering medication directly under the skin or into a muscle. A small needle is used to inject the drug, allowing it to be absorbed quickly into the bloodstream. It's a common method for delivering a variety of medications.
113 services40 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 91361 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
$140.72 typical visit price
range $62.32 – $185.36
Typical copayment $35.18 (range $15.58 – $46.34)
Most-billed visit code 99204
Established Patient
$108.74 typical visit price
range $20.68 – $151.85
Typical copayment $27.18 (range $5.17 – $37.96)
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.

86.1/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality82.93
Promoting Interoperability100
Improvement Activities40
Cost66.73

Referred Medical Equipment & Supplies CMS DME claims 3

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253
DME-Other DME · category DE017N
14 suppliers23 claims37 services$6.07 avg. paid by Medicare
Lancets, per box of 100 A4259
DME-Medical/Surgical Supplies · category DA000N
11 suppliers13 claims13 services$0.95 avg. paid by Medicare
Supply allowance for therapeutic continuous glucose monitor (cgm), includes all supplies and accessories, 1 month supply = 1 unit of service K0553
DME-Other DME · category DE017N
3 suppliers96 claims96 services$174.69 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 12

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

ELLIOTT ARTHUR SCHAFFZIN MD
Orthopaedic Surgery
1250 LA VENTA DR, STE 100
WESTLAKE VILLAGE, CA 91361
Los Angeles County (805) 381-1953
DR. ANITA SUSAN PAKULA MD
Dermatology
1250 LA VENTA DR, 105
WESTLAKE VILLAGE, CA 91361
Los Angeles County (805) 494-6920
SEEMA PATEL
Pharmacy (Community/Retail Pharmacy)
1250 LA VENTA DR
WESTLAKE VILLAGE, CA 91361
Los Angeles County (805) 497-3974
AMANITA RX, INC.
Pharmacy (Community/Retail Pharmacy)
1250 LA VENTA DR, STE 114
WESTLAKE VILLAGE, CA 91361
Los Angeles County (805) 497-3974
DR. LEENA SHANKAR NATHAN M.D.
Obstetrics & Gynecology
1250 LA VENTA DR, SUITE 105
WESTLAKE VILLAGE, CA 91361
Los Angeles County (805) 557-7180
STEPHANIE J MANDELMAN M D INC
Obstetrics & Gynecology
1250 LA VENTA DR, 101B
WESTLAKE VILLAGE, CA 91361
Los Angeles County (805) 496-0880
DR. RAUZ ANGELIC ESHRAGHI M.D.
Internal Medicine
1250 LA VENTA DR, STE. 202
WESTLAKE VILLAGE, CA 91361
Los Angeles County (805) 496-5153
DR. ANGELA THERESA VALLE MD
Obstetrics & Gynecology
1250 LA VENTA DR, SUITE 105
WESTLAKE VILLAGE, CA 91361
Los Angeles County (805) 557-7180

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 Jennifer Siani's NPI number?

The NPI number for Jennifer Siani is 1649613761. It was assigned to this individual provider in the NPPES registry on April 8, 2013.

Where is Jennifer Siani located?

Jennifer Siani practices at 1250 La Venta Dr Ste 101A, 207, 211, Westlake Village, CA 91361. The listed phone number is (805) 494-6920.

What is Jennifer Siani's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.

Is Jennifer Siani enrolled in Medicare?

Yes. Jennifer Siani 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 Jennifer Siani was last updated on March 20, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 months 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.