1. Home
  2. Directory
  3. Maryland
  4. Rockville
  5. Psychologist
  6. NPI Profile

DR. FREDERICK JOHN OELTJEN PH.D.
NPI 1942348487
Psychologist - Clinical in Rockville, MD

Active since February 04, 2007Opted out of Medicare · through Jul 1, 2027
20 COURTHOUSE SQ, SUITE 202, ROCKVILLE, MD 20850(301) 424-6955(301) 424-4836 Get Directions Write a Review

NPPES record last updated: July 8, 2007. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Dr. Frederick John Oeltjen Ph.d. NPPES

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

DR. FREDERICK JOHN OELTJEN PH.D. (NPI 1942348487) is an individual clinical provider in Rockville, Maryland, licensed in Maryland (01189) and active in the NPI registry since February 2007. He has opted out of Medicare through July 1, 2027 and remains eligible to order and refer.

NPPES Registry Identity

NPI1942348487
Entity TypeIndividualMale
Primary Taxonomy103TC0700X
Provider Legal NameDR. FREDERICK JOHN OELTJENCredential: PH.D.
Location Address20 COURTHOUSE SQ, SUITE 202Rockville, MD 20850-2336
Mailing Address20 Courthouse Sq, Suite 202Rockville, MD 20850-2336 · (301) 424-6955 · Fax (301) 424-4836
Phone(301) 424-6955
Fax(301) 424-4836
Sole ProprietorNo
Enumeration DateFebruary 4, 2007
Last NPPES UpdateJuly 8, 2007
✔ NPI 1942348487 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychologist · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code103TC0700X
Licenses✔ Licensed in MD · 01189✔ Licensed in DC · PSY964
Definition
A psychologist who provides continuing and comprehensive mental and behavioral health care for individuals and families; consultation to agencies and communities; training, education and supervision; and research-based practice. It is a specialty in breadth -- one that is broadly inclusive of severe psychopathology -- and marked by comprehensiveness and integration of knowledge and skill from a broad array of disciplines within and outside of psychology proper. The scope of clinical psychology encompasses all ages, multiple diversities and varied systems.
20 COURTHOUSE SQ, Rockville, MD 20850
Open in Google Maps ↗

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Dr. Frederick John Oeltjen Ph.d. has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from July 1, 2013 through July 1, 2027.

Opt-Out Effective DateJuly 1, 2013
Opt-Out In Effect ThroughJuly 1, 2027Opt-out affidavits renew automatically every two years unless cancelled
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency– Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 20850 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
$194.86 typical visit price
range $65.18 – $194.86
Typical copayment $48.71 (range $16.29 – $48.71)
Most-billed visit code 99205
Established Patient
$113.72 typical visit price
range $21.40 – $158.88
Typical copayment $28.43 (range $5.35 – $39.72)
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 7

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

DENINE RACHELLE BOWMAN PHD
Counselor (Professional)
20 COURTHOUSE SQ, SUITE 202
ROCKVILLE, MD 20850
Montgomery County (301) 424-6955
DR. PETER P TONG D.D.S.
Dentist (General Practice)
20 COURTHOUSE SQ, STE 105
ROCKVILLE, MD 20850
Montgomery County (301) 424-8888
DR. LAUREN C. CARAVELLA PSY.D
Psychologist (Clinical)
20 COURTHOUSE SQ, SUITE 202
ROCKVILLE, MD 20850
Montgomery County (301) 424-6955
PETER TONG DDS PA
Clinic/Center (Dental)
20 COURTHOUSE SQ, SUITE 105
ROCKVILLE, MD 20850
Montgomery County (301) 424-8888
MS. MAHSHID MISHA TAWAKOLI LCSW-C
Social Worker (Clinical)
20 COURTHOUSE SQ, SUITE 202
ROCKVILLE, MD 20850
Montgomery County (301) 424-6955
WAYNE RHEE
Psychologist (Clinical)
20 COURTHOUSE SQ, SUITE 202
ROCKVILLE, MD 20850
Montgomery County (202) 302-5130
MARYLAND COUNSELING CENTERS, INC.
Psychologist (Clinical)
20 COURTHOUSE SQ, SUITE 202
ROCKVILLE, MD 20850
Montgomery County (301) 424-6955

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 Frederick Oeltjen's NPI number?

The NPI number for Frederick Oeltjen is 1942348487. It was assigned to this individual provider in the NPPES registry on February 4, 2007.

Where is Frederick Oeltjen located?

Frederick Oeltjen practices at 20 Courthouse Sq Suite 202, Rockville, MD 20850. The listed phone number is (301) 424-6955.

What is Frederick Oeltjen's specialty?

The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.

Is Frederick Oeltjen enrolled in Medicare?

No. Frederick Oeltjen has opted out of Medicare through July 1, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

When was this NPI record last updated?

The NPPES record for Frederick Oeltjen was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years 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.