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MARY A WILLIAMS DNP, FNP-BC, PMHNP-C
NPI 1184806150
Nurse Practitioner - Family in Clarksdale, MS

Active since December 03, 2007PECOS EnrolledAccepts Medicare Assignment
125 HIGHWAY 322, CLARKSDALE, MS 38614(662) 351-1970 Get Directions Write a Review

NPPES record last updated: April 22, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Apr 22, 2026, Aug 7, 2025, Jun 11, 2019 and 2 more (5 updates tracked since 2017).

About Mary A Williams Dnp, Fnp-bc, Pmhnp-c NPPES

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

MARY A WILLIAMS DNP, FNP-BC, PMHNP-C (NPI 1184806150) is an individual family provider in Clarksdale, Mississippi, licensed in Mississippi (R854909) and active in the NPI registry since December 2007. She is enrolled in Medicare PECOS, is affiliated with Northwest Missississippi Regional Medical Center, and is a graduate of Other (2011).

NPPES Registry Identity

NPI1184806150
Entity TypeIndividualFemale
Primary Taxonomy363LF0000X
Provider Legal NameMARY A WILLIAMSCredential: DNP, FNP-BC, PMHNP-C
Location Address125 HIGHWAY 322Clarksdale, MS 38614
Mailing Address125 Highway 322Clarksdale, MS 38614-4620 · (662) 351-1970 · Fax (662) 351-1972
Phone(662) 351-1970
Sole ProprietorNo
Medical School CMSOtherGraduated 2011
Enumeration DateDecember 3, 2007
Last NPPES UpdateApril 22, 20265 updates tracked since enumeration
NPPES CertifiedApril 22, 2026
✔ NPI 1184806150 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyNurse Practitioner · FamilyPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363LF0000X
License✔ Licensed in MS · R854909
Also ListedNurse Practitioner · Psychiatric/Mental HealthTaxonomy 363LP0808X · License 854909 (MS)
125 HIGHWAY 322, Clarksdale, MS 38614
Open in Google Maps ↗

Other Identifiers 1

Medicaid08038821MS

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Magnolia Health and more.Insurance ›

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

Mary A Williams Dnp, Fnp-bc, Pmhnp-c 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 ID2466362439
PECOS Enrollment IDI20100226000232
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 9

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, dexamethasone sodium phosphate, 1 mg J1100
Dexamethasone sodium phosphate is a medication given via injection. It is a type of steroid that helps reduce inflammation and immune responses. It can be used to treat a variety of conditions, such as allergies, skin conditions, arthritis, and more.
243 services30 patients
Injection, ceftriaxone sodium, per 250 mg J0696
Ceftriaxone sodium is an antibiotic injection used to treat a variety of bacterial infections. Each injection contains 250 mg of the medicine. It works by stopping the growth of bacteria in your body.
146 services29 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.
133 services75 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.
65 services44 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.
64 services50 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.
61 services39 patients

Hospital Affiliations CMS Care Compare

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

Northwest Missississippi Regional Medical Center

Acute Care Hospitals · Clarksdale, MS
OwnershipProprietary
CMS Certification Number250042
Location1970 Hospital DriveClarksdale, MS 38614 · Coahoma County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 38614 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
$80.50 typical visit price
range $51.65 – $159.18
Typical copayment $20.12 (range $12.91 – $39.79)
Most-billed visit code 99203
Established Patient
$92.20 typical visit price
range $16.15 – $129.61
Typical copayment $23.05 (range $4.03 – $32.40)
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 2

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

Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing E0431
DME-Oxygen and Supplies · category DC000N
1 supplier12 claims12 services$21.30 avg. paid by Medicare
Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390
DME-Oxygen and Supplies · category DC002N
1 supplier12 claims12 services$119.41 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 3

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

URGENT & PRIMARY CARE OF CLARKSDALE LLC
Psychiatry & Neurology (Psychiatry)
125 HIGHWAY 322
CLARKSDALE, MS 38614
Coahoma County (662) 313-3269
MARIAN SMITH FNP
Nurse Practitioner
125 HIGHWAY 322
CLARKSDALE, MS 38614
Coahoma County (662) 351-1970
MRS. KRISTALIN YOUNG PRESLEY FNP
Nurse Practitioner (Family)
125 HIGHWAY 322
CLARKSDALE, MS 38614
Coahoma County (662) 351-1970

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 Mary Williams's NPI number?

The NPI number for Mary Williams is 1184806150. It was assigned to this individual provider in the NPPES registry on December 3, 2007.

Where is Mary Williams located?

Mary Williams practices at 125 Highway 322, Clarksdale, MS 38614. The listed phone number is (662) 351-1970.

What is Mary Williams's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.

Is Mary Williams enrolled in Medicare?

Yes. Mary Williams 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.

What insurance does Mary Williams accept?

Health plans from Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Magnolia Health, Ambetter of Alabama and Ambetter of Tennessee and 2 other insurers list Mary Williams 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 Mary Williams affiliated with any hospitals?

According to CMS data, Mary Williams is affiliated with Northwest Missississippi Regional Medical Center.

When was this NPI record last updated?

The NPPES record for Mary Williams was last updated on April 22, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.