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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

TAMMY JOY SENN CNM
NPI 1225287642
Advanced Practice Midwife in Columbia, MD

Active since September 10, 2008PECOS Enrolled
10710 CHARTER DR STE 200, COLUMBIA, MD 21044(410) 997-0580(410) 997-6019 Get Directions Write a Review

NPPES record last updated: September 10, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Tammy Joy Senn Cnm NPPES

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

TAMMY JOY SENN CNM (NPI 1225287642) is an individual advanced practice midwife in Columbia, Maryland, licensed in Maryland (R134698) and active in the NPI registry since September 2008. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1225287642
Entity TypeIndividualFemale
Primary Taxonomy367A00000X
Provider Legal NameTAMMY JOY SENNCredential: CNM
Location Address10710 CHARTER DR STE 200Columbia, MD 21044-3259
Mailing Address9910 Franklin Square Dr Ste 2110Baltimore, MD 21236-4902 · (410) 933-6423
Phone(410) 997-0580
Fax(410) 997-6019
Sole ProprietorNo
Enumeration DateSeptember 10, 2008
Last NPPES UpdateSeptember 10, 2026
NPPES CertifiedSeptember 10, 2026
✔ NPI 1225287642 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAdvanced Practice MidwifePhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code367A00000X
Licenses✔ Licensed in MD · R134698✔ Licensed in PA · MW010178✔ Licensed in DE · LK-0010277
Definition
Advanced practice midwifery encompasses the independent provision of care during pregnancy, childbirth, and the postpartum period; sexual and reproductive health; gynecologic health; and family planning services, including preconception care. Midwives also provide primary care for individuals from adolescence throughout the lifespan as well as care for the healthy newborn during the first 28 days of life. Midwives provide initial and ongoing comprehensive assessment, diagnosis, and treatment. Midwifery care includes health promotion, disease prevention, risk assessment and management, and individualized wellness education and counseling. Source: American College of Nurse-Midwives, www.midwife.org Additional Resources: See the American College of Nurse-Midwives, www.midwife.org, for more information on Certified Nurse-Midwives, Certified Midwives, the American Midwifery Certification Board (AMCB), and licensure.
10710 CHARTER DR STE 200, Columbia, MD 21044
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Other Names 1

Former Name (1)Tammy Joy Hurley Cnm

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Tammy Joy Senn Cnm is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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

Johns Hopkins University
0.3 mi
Body Imaging
10840 LITTLE PATUXENT PKWY
Columbia, MD 21044
  • Reassigned Medicare billing, Maryland enrollment
  • 4,483 clinicians in this Medicare group
NPI 1285453795 (410) 933-0000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 21044 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
$94.08 typical visit price
range $60.73 – $183.44
Typical copayment $23.52 (range $15.18 – $45.86)
Most-billed visit code 99203
Established Patient
$75.47 typical visit price
range $19.60 – $149.17
Typical copayment $18.86 (range $4.90 – $37.29)
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 10

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

NDEYE SALL MD
Obstetrics & Gynecology
10710 CHARTER DR STE 200
COLUMBIA, MD 21044
Howard County (443) 367-4700
JOHNS HOPKINS COMMUNITY PHYSICIANS, INC
Internal Medicine
10710 CHARTER DR STE 200
COLUMBIA, MD 21044
Howard County (410) 955-5000
DR. MEGHAN PRATTS O'CONNOR M.D.
Obstetrics & Gynecology
10710 CHARTER DR STE 200
COLUMBIA, MD 21044
Howard County (410) 884-8194
SISIRA SRISUTIVA MD
Obstetrics & Gynecology
10710 CHARTER DR STE 200
COLUMBIA, MD 21044
Howard County (443) 367-4700
JOHNS HOPKINS UNIVERSITY
Optometrist (Vision Therapy)
10710 CHARTER DR STE 200
COLUMBIA, MD 21044
Howard County (443) 367-4700
DR. MONICA KATHLEEN BAUER M.D.
Obstetrics & Gynecology
10710 CHARTER DR STE 200
COLUMBIA, MD 21044
Howard County (410) 884-8000
MOHAMMED S AHMED MD
Obstetrics & Gynecology
10710 CHARTER DR STE 200
COLUMBIA, MD 21044
Howard County (410) 884-8000
JOHNS HOPKINS UNIVERSITY
Ophthalmology
10710 CHARTER DR STE 200
COLUMBIA, MD 21044
Howard County (443) 367-4700

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 Tammy Senn's NPI number?

The NPI number for Tammy Senn is 1225287642. It was assigned to this individual provider in the NPPES registry on September 10, 2008. The provider is also known as Tammy Joy Hurley Cnm.

Where is Tammy Senn located?

Tammy Senn practices at 10710 Charter Dr Ste 200, Columbia, MD 21044. The listed phone number is (410) 997-0580.

What is Tammy Senn's specialty?

The primary specialty registered for this NPI is Advanced Practice Midwife with taxonomy code 367A00000X.

Is Tammy Senn enrolled in Medicare?

Yes. Tammy Senn is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Tammy Senn's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Tammy Senn reassigns Medicare benefits to Johns Hopkins University (Columbia, 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 Tammy Senn'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 Tammy Senn was last updated on September 10, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 44 days 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.