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DR. TANGUY YANN SEIWERT M.D.
NPI 1043340292
Internal Medicine - Medical Oncology in Baltimore, MD

Active since March 06, 2007PECOS Enrolled
74.39/100
CMS Quality Rating
9910 FRANKLIN SQUARE DR STE 2110, BALTIMORE, MD 21236(410) 933-6423 Get Directions Write a Review

NPPES record last updated: August 12, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Aug 12, 2025, Aug 6, 2019 (2 updates tracked since 2019).

About Dr. Tanguy Yann Seiwert M.d. NPPES

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

DR. TANGUY YANN SEIWERT M.D. (NPI 1043340292) is an individual medical oncology provider in Baltimore, Maryland, licensed in Maryland (D88003) and active in the NPI registry since March 2007. He is enrolled in Medicare PECOS, is affiliated with Johns Hopkins Hospital, The, and is a graduate of Other (1999).

NPPES Registry Identity

NPI1043340292
Entity TypeIndividualMale
Primary Taxonomy207RX0202X
Provider Legal NameDR. TANGUY YANN SEIWERTCredential: M.D.
Location Address9910 FRANKLIN SQUARE DR STE 2110Baltimore, MD 21236-4902
Mailing Address814 Partin WayGeorgetown, DE 19947-8715 · (302) 447-9009 · Fax (321) 471-1136
Phone(410) 933-6423
Sole ProprietorNo
Medical School CMSOtherGraduated 1999
Enumeration DateMarch 6, 2007
Last NPPES UpdateAugust 12, 20252 updates tracked since enumeration
NPPES CertifiedAugust 12, 2025
✔ NPI 1043340292 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Medical OncologyAllopathic & Osteopathic Physicians
Taxonomy Code207RX0202X
License✔ Licensed in MD · D88003
Definition
An internist who specializes in the diagnosis and treatment of all types of cancer and other benign and malignant tumors. This specialist decides on and administers therapy for these malignancies as well as consults with surgeons and radiotherapists on other treatments for cancer.
9910 FRANKLIN SQUARE DR STE 2110, Baltimore, MD 21236
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Other Names 1

Former Name (1)Dr. Tanguy Yann Seiwert M.d.

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Tanguy Yann Seiwert M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID9830299833
PECOS Enrollment IDI20190829000016
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 7

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.
130 services64 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.
123 services53 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
66 services19 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.
50 services50 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.
40 services24 patients
Hospital discharge day management, more than 30 minutes 99239
Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.
12 services12 patients

Hospital Affiliations CMS Care Compare

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

Johns Hopkins Hospital, The

Acute Care Hospitals · Baltimore, MD
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number210009
Location600 North Wolfe StreetBaltimore, MD 21287 · Baltimore City County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 21236 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
$183.44 typical visit price
range $60.73 – $183.44
Typical copayment $45.86 (range $15.18 – $45.86)
Most-billed visit code 99205
Established Patient
$106.59 typical visit price
range $19.60 – $149.17
Typical copayment $26.64 (range $4.90 – $37.29)
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.

74.39/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality64.71
Promoting Interoperability97
Improvement Activities40
Cost52.43

Other Providers at the Same Location NPPES

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

DR. BENJAMIN P LEVY MD
Internal Medicine (Hematology & Oncology)
9910 FRANKLIN SQUARE DR STE 2110
BALTIMORE, MD 21236
Baltimore County (410) 933-6423

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 Tanguy Seiwert's NPI number?

The NPI number for Tanguy Seiwert is 1043340292. It was assigned to this individual provider in the NPPES registry on March 6, 2007. The provider is also known as Dr. Tanguy Yann Seiwert M.D..

Where is Tanguy Seiwert located?

Tanguy Seiwert practices at 9910 Franklin Square Dr Ste 2110, Baltimore, MD 21236. The listed phone number is (410) 933-6423.

What is Tanguy Seiwert's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.

Is Tanguy Seiwert enrolled in Medicare?

Yes. Tanguy Seiwert is registered in the Medicare PECOS enrollment system.

Is Tanguy Seiwert affiliated with any hospitals?

According to CMS data, Tanguy Seiwert is affiliated with Johns Hopkins Hospital, The.

When was this NPI record last updated?

The NPPES record for Tanguy Seiwert was last updated on August 12, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.