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MRS. MONA WILLIAMS - GREGORY APN,
NPI 1336244227
Nurse Practitioner - Psychiatric/Mental Health in Edison, NJ

Active since September 14, 2006PECOS EnrolledAccepts Medicare Assignment
6 KILMER RD UNIT A114, EDISON, NJ 08817(908) 720-9191(845) 999-3661 Get Directions Write a Review

NPPES record last updated: July 19, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jul 19, 2026, Mar 6, 2026, Nov 16, 2024 (3 updates tracked since 2024).

About Mrs. Mona Williams - Gregory Apn, NPPES

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

MRS. MONA WILLIAMS - GREGORY APN, (NPI 1336244227) is an individual psychiatric/mental health provider in Edison, New Jersey, licensed in New Jersey (26NJ00112400) and active in the NPI registry since September 2006. She is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Other (2015).

NPPES Registry Identity

NPI1336244227
Entity TypeIndividualFemale
Primary Taxonomy363LP0808X
Provider Legal NameMRS. MONA WILLIAMS - GREGORYCredential: APN,
Location Address6 KILMER RD UNIT A114Edison, NJ 08817-2432
Mailing Address6 Kilmer Rd Unit A114Edison, NJ 08817-2432 · (908) 720-9191 · Fax (845) 999-3661
Phone(908) 720-9191
Fax(845) 999-3661
Sole ProprietorNo
Medical School CMSOtherGraduated 2015
Enumeration DateSeptember 14, 2006
Last NPPES UpdateJuly 19, 20263 updates tracked since enumeration
NPPES CertifiedJuly 19, 2026
✔ NPI 1336244227 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
Licenses✔ Licensed in NJ · 26NJ00112400✔ Licensed in NY · F408532✔ Licensed in PA · SP027974
Also ListedNurse Practitioner · Acute CareTaxonomy 363LA2100X · License 26NJ00112400 (NJ)
6 KILMER RD UNIT A114, Edison, NJ 08817
Open in Google Maps ↗

Secondary Practice Locations 2

Location 1247 Main StStaten Island, NY 10307-1228 · Phone (908) 720-9191 · Fax (845) 999-3661
Location 21515 Market St Ste 1200Philadelphia, PA 19102-1932 · Phone (908) 720-9191 · Fax (845) 999-3661

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter Health, Ambetter Health of Delaware, 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

Mrs. Mona Williams - Gregory Apn, 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 ID9133213457
PECOS Enrollment IDI20070918000257
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

8

Medicare enrollment records show Mona Williams - Gregory reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Rutgers Health-Rwj Neurosurgery Faculty
2.1 mi
Urology
195 LITTLE ALBANY ST
New Brunswick, NJ 08901
  • Reassigned Medicare billing, New Jersey enrollment
  • 259 clinicians in this Medicare group
NPI 1710012604 (732) 235-2465
Robert Wood Johnson Medical Associates
2.3 mi
Hospitalist
1 ROBERT WOOD JOHNSON PL
New Brunswick, NJ 08901
  • Reassigned Medicare billing, New Jersey enrollment
  • 306 clinicians in this Medicare group
NPI 1902848625 (732) 235-7840
Rutgers Health-Rwj Neurosurgery Faculty
9.6 mi
Surgery
110 REHILL AVE
Somerville, NJ 08876
  • Reassigned Medicare billing, New Jersey enrollment
  • 28 clinicians in this Medicare group
NPI 1548356926 (908) 685-2856
Barnabas Health Medical Group PC
15 mi
Specialist
225 WILLIAMSON ST
Elizabeth, NJ 07202
  • Reassigned Medicare billing, New Jersey enrollment
  • 1,894 clinicians in this Medicare group
NPI 1841557246 (888) 724-7123
Nj Memory And Behavioral Care
21 mi
Geriatric Psychiatry
14 RIDGEDALE AVE STE 103
Cedar Knolls, NJ 07927
  • Reassigned Medicare billing, New Jersey enrollment
  • 114 clinicians in this Medicare group
NPI 1538499181 (973) 295-6335
Brain Ways LLC
22 mi
Clinic/Center
13 HARRIS CT
Lawrence, NJ 08648
  • Reassigned Medicare billing, New Jersey enrollment
  • 7 clinicians in this Medicare group
NPI 1801556691 (609) 815-5618
Grow Healthcare Group Of New Jersey PC
26 mi
Mental Health
221 RIVER ST. FL 9
Hoboken, NJ 07030
  • Reassigned Medicare billing, New Jersey enrollment
  • 673 clinicians in this Medicare group
NPI 1841949328 (201) 439-8902
Grow Healthcare Group PA
1,069 mi
Mental Health
66 W FLAGLER ST STE 900
Miami, FL 33130
  • Reassigned Medicare billing, Pennsylvania enrollment
  • 833 clinicians in this Medicare group
NPI 1245845932 (786) 244-7711

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 4

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.

Residence visit for established patient with moderate level of medical decision making, per day, if using time, at least 40 minutes 99349
An established patient home visit is a medical appointment conducted at your home, typically lasting around 40 minutes. This service is ideal for patients who may find it difficult to travel to a healthcare facility. During this visit, a healthcare professional will evaluate your health status, manage your care, and answer any health-related questions you may have.
514 services218 patients
Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes 99309
A follow-up nursing facility visit per day is a daily check-in by a healthcare professional. This 25-minute visit typically involves monitoring your health progress, addressing any concerns, and adjusting treatment plans as necessary. It's a vital part of ensuring your ongoing wellbeing.
431 services110 patients
Psychiatric diagnostic evaluation with medical services 90792
A psychiatric diagnostic evaluation with medical services is a comprehensive assessment. It includes a detailed examination of your mental health and physical wellbeing, as well as your personal and family history. This evaluation aids in creating an effective treatment plan.
73 services71 patients
Psychiatric diagnostic evaluation with medical services 90792
A psychiatric diagnostic evaluation with medical services is a comprehensive assessment. It includes a detailed examination of your mental health and physical wellbeing, as well as your personal and family history. This evaluation aids in creating an effective treatment plan.
39 services39 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 08817 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
$98.09 typical visit price
range $63.84 – $190.92
Typical copayment $24.52 (range $15.96 – $47.73)
Most-billed visit code 99203
Established Patient
$111.57 typical visit price
range $20.97 – $155.92
Typical copayment $27.89 (range $5.24 – $38.98)
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.

Other Providers at the Same Location NPPES

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

MWG EDUCATOR AND CLINICIAN LLC
Nurse Practitioner (Psychiatric/Mental Health)
6 KILMER RD UNIT A114
EDISON, NJ 08817
Middlesex County (908) 720-9191

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 Mona Williams - Gregory's NPI number?

The NPI number for Mona Williams - Gregory is 1336244227. It was assigned to this individual provider in the NPPES registry on September 14, 2006.

Where is Mona Williams - Gregory located?

Mona Williams - Gregory practices at 6 Kilmer Rd Unit A114, Edison, NJ 08817. The listed phone number is (908) 720-9191.

What is Mona Williams - Gregory's specialty?

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

Is Mona Williams - Gregory enrolled in Medicare?

Yes. Mona Williams - Gregory 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 Mona Williams - Gregory's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mona Williams - Gregory reassigns Medicare benefits to 8 organizations: Rutgers Health-Rwj Neurosurgery Faculty (New Brunswick, NJ), Robert Wood Johnson Medical Associates (New Brunswick, NJ), Rutgers Health-Rwj Neurosurgery Faculty (Somerville, NJ), Barnabas Health Medical Group PC (Elizabeth, NJ), Nj Memory And Behavioral Care (Cedar Knolls, NJ) and 3 more organizations, listed in the Medicare section above. 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 Mona Williams - Gregory's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Mona Williams - Gregory accept?

Health plans from Ambetter Health, Ambetter Health of Delaware and Oscar Health list Mona Williams - Gregory 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.

When was this NPI record last updated?

The NPPES record for Mona Williams - Gregory was last updated on July 19, 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.