DR. JOANNA B TYZACK MD
NPI 1487659892
Internal Medicine - Endocrinology, Diabetes & Metabolism in Timonium, MD

Q: What is Joanna Tyzack's NPI number?

The NPI number for Joanna Tyzack is 1487659892. It was assigned to this individual provider in the NPPES registry on June 14, 2005.

Q: What is Joanna Tyzack's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for Joanna Tyzack was last updated on May 9, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.

Active since June 14, 2005PECOS EnrolledAccepts Medicare Assignment

1 TEXAS STATION CT, SUITE 300, TIMONIUM, MD 21093(410) 828-7417(410) 828-4695 Get Directions Write a Review

NPPES record last updated: May 9, 2025. Verified against the NPPES registry weekly; last sync: November 01, 2026.

On this page

About Dr. Joanna B Tyzack Md NPPES

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

DR. JOANNA B TYZACK MD (NPI 1487659892) is an individual endocrinology, diabetes & metabolism provider in Timonium, Maryland, licensed in Maryland (D42383) and active in the NPI registry since June 2005. She is enrolled in Medicare PECOS, is affiliated with Johns Hopkins Hospital, The, and is a graduate of Medical University Of South Carolina College Of Medicine (1988).

NPPES Registry Identity

NPI1487659892

Entity TypeIndividualFemale

Primary Taxonomy207RE0101X

Provider Legal NameDR. JOANNA B TYZACKCredential: MD

Location Address1 TEXAS STATION CT, SUITE 300Timonium, MD 21093-8286

Mailing Address1 Texas Station Ct, Suite 300Timonium, MD 21093-8286 · (410) 828-7417 · Fax (410) 828-4695

Phone(410) 828-7417

Fax(410) 828-4695

Sole ProprietorNo

Medical School CMSMedical University Of South Carolina College Of MedicineGraduated 1988

Enumeration DateJune 14, 2005

Last NPPES UpdateMay 9, 2025

✔ NPI 1487659892 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 MD · D42383

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.

1 TEXAS STATION CT, Timonium, MD 21093

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Other Identifiers 1

Medicaid203561600MD

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Health.Insurance ›

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. Joanna B Tyzack 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 ID3274513197

PECOS Enrollment IDI20040721001729

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 Reassignments

Medicare enrollment records show Joanna Tyzack reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Bay West Endocrinology Associates

Same address

Specialist

1 TEXAS STATION CT
Timonium, MD 21093

Reassigned Medicare billing, Maryland enrollment
11 clinicians in this Medicare group

NPI 1093918328 (410) 828-7417

Privia Medical Group, LLC

47 mi

Internal Medicine

950 N GLEBE RD STE 700
Arlington, VA 22203

Reassigned Medicare billing, Maryland enrollment
668 clinicians in this Medicare group

NPI 1013042480 (571) 366-8850

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 14

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, 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.

15,360 services161 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.

979 services652 patients

Insertion of needle into vein for collection of blood sample 36415

This procedure involves inserting a small needle into a vein, typically in your arm, to collect a blood sample. It's a quick and simple process to help diagnose or monitor health conditions. You may feel a small prick, but discomfort is minimal.

642 services477 patients

Blood glucose (sugar) test performed by hand-held instrument 82962

A blood glucose test uses a handheld device to measure the amount of sugar in your blood. A small prick on your finger allows a drop of blood to be placed on a test strip, which is then read by the device. This helps monitor and manage diabetes effectively.

606 services281 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.

590 services279 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.

260 services164 patients

Dxa bone density measurement of hip, pelvis, spine 77080

A DXA bone density measurement is a simple, quick, and non-invasive procedure that assesses the strength of your bones. This test uses X-rays to measure the amount of minerals, mainly calcium, in the hip, pelvis, and spine. It helps in early detection of osteoporosis or other bone diseases.

251 services251 patients

Ultrasound scan of head and neck soft tissue 76536

An ultrasound scan of the head and neck soft tissue is a non-invasive procedure that uses sound waves to create images of the soft tissues in these areas. It helps identify any abnormalities or issues, such as tumors, cysts, or infections. It's painless and doesn't involve radiation.

235 services225 patients

Continuous monitoring of blood sugar level in tissue fluid using sensor under skin with interpretation and report 95251

This procedure involves placing a small sensor under your skin to continuously monitor your blood sugar levels in tissue fluid. The data is interpreted and a report is generated to help manage your diabetes more effectively.

217 services94 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.

199 services149 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.

81 services72 patients

Dxa bone density measurement of forearm, finger, hand, or foot 77081

A DXA bone density measurement of the forearm, finger, hand, or foot is a non-invasive procedure that uses X-rays to measure the amount of calcium and other minerals in your bones. This test helps to assess the strength of your bones and your risk of fractures.

51 services51 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.

37 services37 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.

22 services17 patients

Hospital Affiliations CMS Care Compare 2

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

Greater Baltimore Medical Center

Acute Care Hospitals · Baltimore, MD

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number210044

Location6701 North Charles StreetBaltimore, MD 21204 · Baltimore County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 21093 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

$139.05 typical visit price

range $60.73 – $183.44

Typical copayment $34.76 (range $15.18 – $45.86)

Most-billed visit code 99204

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.

Reported Quality Measures

e-Prescribing

At least one permissible prescription written by the MIPS eligible clinician is queried for a drug formulary and transmitted electronically using certified EHR technology.

84%3,647 patients2/55-star benchmark: 99%

Medication Reconciliation

The MIPS eligible clinician performs medication reconciliation for at least one transition of care in which the patient is transitioned into the care of the MIPS eligible clinician.

99%134 patients4/55-star benchmark: 100%

Patient-Specific Education

The MIPS eligible clinician must use clinically relevant information from CEHRT to identify patient-specific educational resources and provide access to those materials to at least one unique patient seen by the MIPS eligible clinician.

4%1,543 patients1/55-star benchmark: 97%

Provide Patient Access

At least one patient seen by the MIPS eligible clinician during the performance period is provided timely access to view online, download, and transmit to a third party their health information subject to the MIPS eligible clinician's discretion to withhold…

99%1,536 patients4/55-star benchmark: 100%

Secure Messaging

For at least one unique patient seen by the MIPS eligible clinician during the performance period, a secure message was sent using the electronic messaging function of CEHRT to the patient (or the patient-authorized representative), or in response to a secure…

69%1,536 patients4/55-star benchmark: 89%

View, Download, or Transmit (VDT)

At least one patient seen by the MIPS eligible clinician during the performance period (or patient-authorized representative) views, downloads or transmits their health information to a third party during the performance period.

62%1,536 patients

Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Referred Medical Equipment & Supplies CMS DME claims 9

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

Supplies for maintenance of insulin infusion catheter, per week A4224

DME-Other DME · category DE017N

7 suppliers54 claims697 services$18.29 avg. paid by Medicare

Supplies for external insulin infusion pump, syringe type cartridge, sterile, each A4225

DME-Other DME · category DE017N

7 suppliers48 claims1,630 services$2.36 avg. paid by Medicare

Supply allowance for adjunctive continuous glucose monitor (cgm), includes all supplies and accessories, 1 month supply = 1 unit of service A4238

DME-Medical/Surgical Supplies · category DA000N

2 suppliers18 claims18 services$171.60 avg. paid by Medicare

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253

DME-Other DME · category DE017N

50 suppliers125 claims516 services$5.89 avg. paid by Medicare

Lancets, per box of 100 A4259

DME-Medical/Surgical Supplies · category DA000N

22 suppliers47 claims97 services$1.06 avg. paid by Medicare

Intermittent urinary catheter; straight tip, with or without coating (teflon, silicone, silicone elastomer, or hydrophilic, etc.), each A4351

DME-Orthotic Devices · category DF008N

1 supplier11 claims660 services$1.38 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.

DR. RUTH S HOROWITZ MD

Internal Medicine (Endocrinology, Diabetes & Metabolism)

1 TEXAS STATION CT
TIMONIUM, MD 21093

Baltimore County (410) 828-7417

KATHERINE STOUT DNP, CRNP FNP-BC

Nurse Practitioner

1 TEXAS STATION CT
LUTHERVILLE TIMONIUM, MD 21093

Baltimore County (410) 828-7417

BAY WEST ENDOCRINOLOGY ASSOCIATES

Specialist

1 TEXAS STATION CT
TIMONIUM, MD 21093

Baltimore County (410) 828-7417

ALLISON JOY SZTAJER LCSW-C

Social Worker (Clinical)

1 TEXAS STATION CT, SUITE 210
TIMONIUM, MD 21093

Baltimore County (410) 683-3380

VIVIAN Y PAO MD

Internal Medicine (Endocrinology, Diabetes & Metabolism)

1 TEXAS STATION CT, SUITE 300
TIMONIUM, MD 21093

Baltimore County (410) 828-7417

JENNIFER ANN MALLOY PA-C

Physician Assistant (Medical)

1 TEXAS STATION CT
TIMONIUM, MD 21093

Baltimore County (410) 828-7417

DR. XINYUAN NING M.D.

Internal Medicine (Endocrinology, Diabetes & Metabolism)

1 TEXAS STATION CT
TIMONIUM, MD 21093

Baltimore County (410) 828-7417

DEBBY TAYLOR CRNP

Nurse Practitioner

1 TEXAS STATION CT
TIMONIUM, MD 21093

Baltimore County (610) 349-1505

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 Joanna Tyzack's NPI number?

The NPI number for Joanna Tyzack is 1487659892. It was assigned to this individual provider in the NPPES registry on June 14, 2005.

Where is Joanna Tyzack located?

Joanna Tyzack practices at 1 Texas Station Ct Suite 300, Timonium, MD 21093. The listed phone number is (410) 828-7417.

What is Joanna Tyzack's specialty?

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

Is Joanna Tyzack enrolled in Medicare?

Yes. Joanna Tyzack 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.

Which organizations bill Medicare for Joanna Tyzack's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Joanna Tyzack reassigns Medicare benefits to 2 organizations: Bay West Endocrinology Associates (Timonium, MD) and Privia Medical Group, LLC (Arlington, VA). Each 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 Joanna Tyzack's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Joanna Tyzack accept?

Health plans from Oscar Health list Joanna Tyzack as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Joanna Tyzack affiliated with any hospitals?

According to CMS data, Joanna Tyzack is affiliated with Johns Hopkins Hospital, The and Greater Baltimore Medical Center.

When was this NPI record last updated?

The NPPES record for Joanna Tyzack was last updated on May 9, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.