DR. TAMMY PEI-HSIN CHENG SIEVERS MD
NPI 1619004694
Internal Medicine - Rheumatology in Ventura, CA

Q: What is Tammy Sievers's NPI number?

The NPI number for Tammy Sievers is 1619004694. It was assigned to this individual provider in the NPPES registry on February 27, 2007.

Q: What is Tammy Sievers's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Rheumatology, with taxonomy code 207RR0500X.

Q: When was this NPI record last updated?

The NPPES record for Tammy Sievers was last updated on March 8, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.

Active since February 27, 2007PECOS EnrolledAccepts Medicare Assignment

120 N ASHWOOD AVE, VENTURA, CA 93003(805) 658-5800 Get Directions Write a Review

NPPES record last updated: March 8, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Mar 8, 2021, Nov 28, 2017 (2 updates tracked since 2017).

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About Dr. Tammy Pei-hsin Cheng Sievers Md NPPES

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

DR. TAMMY PEI-HSIN CHENG SIEVERS MD (NPI 1619004694) is an individual rheumatology provider in Ventura, California, licensed in California (A110176) and active in the NPI registry since February 2007. She is enrolled in Medicare PECOS, maintains a secondary practice location in Ventura, and is a graduate of Washington University School Of Medicine (2002).

NPPES Registry Identity

NPI1619004694

Entity TypeIndividualFemale

Primary Taxonomy207RR0500X

Provider Legal NameDR. TAMMY PEI-HSIN CHENG SIEVERSCredential: MD

Location Address120 N ASHWOOD AVEVentura, CA 93003-1810

Mailing Address5855 Olivas Park DrVentura, CA 93003-7672 · (805) 667-2801

Phone(805) 658-5800

Sole ProprietorNo

Medical School CMSWashington University School Of MedicineGraduated 2002

Enumeration DateFebruary 27, 2007

Last NPPES UpdateMarch 8, 20212 updates tracked since enumeration

NPPES CertifiedMarch 8, 2021

✔ NPI 1619004694 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · RheumatologyAllopathic & Osteopathic Physicians

Taxonomy Code207RR0500X

License✔ Licensed in CA · A110176

Definition

An internist who treats diseases of joints, muscle, bones and tendons. This specialist diagnoses and treats arthritis, back pain, muscle strains, common athletic injuries and collagen diseases.

120 N ASHWOOD AVE, Ventura, CA 93003

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Secondary Practice Location 1

Location 15855 Olivas Park DrVentura, CA 93003-7672 · Phone (805) 667-2801 · Fax (805) 667-2865

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Tammy Pei-hsin Cheng Sievers 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 ID2466543558

PECOS Enrollment IDI20100309000727

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 Tammy Sievers reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Community Memorial Health System

Same address

Multi-Specialty

120 N ASHWOOD AVE
Ventura, CA 93003

Reassigned Medicare billing, California enrollment
267 clinicians in this Medicare group

NPI 1114111309 (805) 948-5800

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 6

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 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.

777 services243 patients

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.

113 services41 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.

45 services45 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

38 services29 patients

New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205

This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.

24 services24 patients

Aspiration and/or injection of fluid from large joint 20610

This procedure involves using a needle to remove (aspiration) or introduce (injection) fluid into a large joint like the knee or hip. It can help diagnose conditions, relieve discomfort, or deliver medication directly to the joint.

20 services13 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 93003 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.

Referred Medical Equipment & Supplies CMS DME claims

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

Lightweight wheelchair K0003

DME-Wheelchairs · category DD000N

1 supplier11 claims11 services$22.98 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.

SHEILA GHANNADI

Pediatrics