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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 LYNN MERSON MSN, PMHNP-BC
NPI 1235578261
Nurse Practitioner - Psychiatric/Mental Health in Denton, MD

Active since June 24, 2013PECOS EnrolledAccepts Medicare Assignment
108 MARKET ST OFC 3, DENTON, MD 21629(410) 656-1541(854) 400-4919 Get Directions Write a Review

NPPES record last updated: August 26, 2026. Verified against the NPPES registry weekly; last sync: September 27, 2026.

Record update history: Aug 26, 2026, Jan 30, 2026, Jan 9, 2026 and 1 more (4 updates tracked since 2025).

About Tammy Lynn Merson Msn, Pmhnp-bc NPPES

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

TAMMY LYNN MERSON MSN, PMHNP-BC (NPI 1235578261) is an individual psychiatric/mental health provider in Denton, Maryland, licensed in Maryland (R129055) and active in the NPI registry since June 2013. She is enrolled in Medicare PECOS, is affiliated with University Of Md Shore Medical Ctr At Chestertown, and maintains a secondary practice location in Easton.

NPPES Registry Identity

NPI1235578261
Entity TypeIndividualFemale
Primary Taxonomy363LP0808X
Provider Legal NameTAMMY LYNN MERSONCredential: MSN, PMHNP-BC
Location Address108 MARKET ST OFC 3Denton, MD 21629-1035
Mailing Address14955 Greensboro RdGoldsboro, MD 21636-1311 · (410) 924-7360 · Fax (854) 400-4919
Phone(410) 656-1541
Fax(854) 400-4919
Sole ProprietorNo
Medical School CMSOtherGraduated 2026
Enumeration DateJune 24, 2013
Last NPPES UpdateAugust 26, 20264 updates tracked since enumeration
NPPES CertifiedAugust 26, 2026
✔ NPI 1235578261 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyNurse Practitioner · Psychiatric/Mental HealthPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363LP0808X
License✔ Licensed in MD · R129055
Also ListedRegistered NurseTaxonomy 163W00000X · License R129055 (MD)
108 MARKET ST OFC 3, Denton, MD 21629
Open in Google Maps ↗

Secondary Practice Location 1

Location 129466 Pintail DrEaston, MD 21601-9323 · Phone (443) 746-3698

Other Identifiers 2

Other2025092326MD · Ancc
OtherR129055MD · Mbon

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

Tammy Lynn Merson Msn, Pmhnp-bc 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 ID3173002912
PECOS Enrollment IDI20260211001806
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.

Hospital Affiliations CMS Care Compare 2

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

University Of MD Shore Medical Ctr At Chestertown

Acute Care Hospitals · Chestertown, MD
OwnershipVoluntary non-profit - Private
CMS Certification Number210030
Location100 Brown StreetChestertown, MD 21620 · Kent County
Emergency services

University Of MD Shore Medical Center At Easton

Acute Care Hospitals · Easton, MD
2/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number210037
Location219 South Washington StreetEaston, MD 21601 · Talbot County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 21629 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
$89.75 typical visit price
range $57.99 – $175.57
Typical copayment $22.43 (range $14.49 – $43.89)
Most-billed visit code 99203
Established Patient
$102.11 typical visit price
range $18.66 – $143.02
Typical copayment $25.52 (range $4.66 – $35.75)
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.

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 Merson's NPI number?

The NPI number for Tammy Merson is 1235578261. It was assigned to this individual provider in the NPPES registry on June 24, 2013.

Where is Tammy Merson located?

Tammy Merson practices at 108 Market St Ofc 3, Denton, MD 21629. The listed phone number is (410) 656-1541.

What is Tammy Merson's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Psychiatric/Mental Health, with taxonomy code 363LP0808X.

Is Tammy Merson enrolled in Medicare?

Yes. Tammy Merson 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.

Is Tammy Merson affiliated with any hospitals?

According to CMS data, Tammy Merson is affiliated with University Of MD Shore Medical Ctr At Chestertown and University Of MD Shore Medical Center At Easton.

When was this NPI record last updated?

The NPPES record for Tammy Merson was last updated on August 26, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 35 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.