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MARTIN F HAMMAR LISW
NPI 1093850034
Social Worker - Clinical in Athens, OH

Active since February 20, 2007PECOS EnrolledAccepts Medicare Assignment
90 HOSPITAL DR, ATHENS, OH 45701(740) 593-3682(740) 594-5642 Get Directions Write a Review

NPPES record last updated: November 12, 2020. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Nov 12, 2020, Mar 14, 2016 (2 updates tracked since 2016).

About Martin F Hammar Lisw NPPES

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

MARTIN F HAMMAR LISW (NPI 1093850034) is an individual clinical provider in Athens, Ohio, licensed in Ohio (I.1500455) and active in the NPI registry since February 2007. He is enrolled in Medicare PECOS, is affiliated with Hocking Valley Community Hospital, and is a graduate of Other (2013).

NPPES Registry Identity

NPI1093850034
Entity TypeIndividualMale
Primary Taxonomy1041C0700X
Provider Legal NameMARTIN F HAMMARCredential: LISW
Location Address90 HOSPITAL DRAthens, OH 45701-2301
Mailing AddressPo Box 188Chillicothe, OH 45601-0188 · (740) 773-4366 · Fax (740) 773-4750
Phone(740) 593-3682
Fax(740) 594-5642
Sole ProprietorNo
Medical School CMSOtherGraduated 2013
Enumeration DateFebruary 20, 2007
Last NPPES UpdateNovember 12, 20202 updates tracked since enumeration
NPPES CertifiedNovember 12, 2020
✔ NPI 1093850034 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySocial Worker · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code1041C0700X
License✔ Licensed in OH · I.1500455
Definition
A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances.
90 HOSPITAL DR, Athens, OH 45701
Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Buckeye Health Plan, Ambetter from Meridian, Ambetter Health and more.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

Martin F Hammar Lisw 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 ID446571921
PECOS Enrollment IDI20150609002288
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

3

Medicare enrollment records show Martin Hammar reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Hopewell Health Centers Inc
Same address
Primary Care
90 HOSPITAL DR
Athens, OH 45701
  • Reassigned Medicare billing, Ohio enrollment
  • 212 clinicians in this Medicare group
NPI 1427417542 (740) 592-3091
Hocking Valley Community Hospital
23 mi
Critical Access
601 STATE ROUTE 664 N
Logan, OH 43138
  • Reassigned Medicare billing, Ohio enrollment
  • 25 clinicians in this Medicare group
NPI 1295840007 (740) 380-8000
Hocking Valley Medical Group, Inc.
23 mi
Family Medicine
601 STATE ROUTE 664 N
Logan, OH 43138
  • Reassigned Medicare billing, Ohio enrollment
  • 41 clinicians in this Medicare group
NPI 1801994827 (740) 380-8140

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

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.

Psychotherapy, 1 hour 90837
Psychotherapy is a therapeutic interaction or treatment between a trained professional and a patient. In a 1-hour session, you'll talk about your feelings, thoughts, and behaviors to help identify and manage mental health issues. This process aids in personal growth, healing, and improved well-being.
113 services12 patients

Hospital Affiliations CMS Care Compare

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

Hocking Valley Community Hospital

Critical Access Hospitals · Logan, OH
OwnershipVoluntary non-profit - Other
CMS Certification Number361330
Location601 State Route 664NLogan, OH 43138 · Hocking County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 45701 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
$0.00 typical visit price
range $54.34 – $166.65
Typical copayment $0.00 (range $13.58 – $41.66)
Most-billed visit code NA
Established Patient
$68.07 typical visit price
range $17.10 – $135.40
Typical copayment $17.01 (range $4.27 – $33.85)
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 20

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

KATIE WOOD
Case Manager/Care Coordinator
90 HOSPITAL DR
ATHENS, OH 45701
Athens County (740) 592-3091
ELIZABETH NIHISER QMHS
Behavior Analyst
90 HOSPITAL DR
ATHENS, OH 45701
Athens County (740) 592-3091
GREGORY P BEARD QMHS
Case Manager/Care Coordinator
90 HOSPITAL DR
ATHENS, OH 45701
Athens County (740) 592-3091
HEATHER GARY CDCA
Counselor (Addiction (Substance Use Disorder))
90 HOSPITAL DR
ATHENS, OH 45701
Athens County (740) 593-3682
TAMMY M STAGE LPCC-SUPERVISION
Counselor (Professional)
90 HOSPITAL DR
ATHENS, OH 45701
Athens County (740) 592-3091
JALEN CAMPBELL QMHS
Case Manager/Care Coordinator
90 HOSPITAL DR
ATHENS, OH 45701
Athens County (740) 592-3091
MARIKAY J VANDERVEN LPC
Counselor (Professional)
90 HOSPITAL DR
ATHENS, OH 45701
Athens County (740) 593-3682
KATE C JIGGINS LPCC, CDCA
Counselor (Professional)
90 HOSPITAL DR
ATHENS, OH 45701
Athens County (740) 593-3682

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 Martin Hammar's NPI number?

The NPI number for Martin Hammar is 1093850034. It was assigned to this individual provider in the NPPES registry on February 20, 2007.

Where is Martin Hammar located?

Martin Hammar practices at 90 Hospital Dr, Athens, OH 45701. The listed phone number is (740) 593-3682.

What is Martin Hammar's specialty?

The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.

Is Martin Hammar enrolled in Medicare?

Yes. Martin Hammar 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 Martin Hammar's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Martin Hammar reassigns Medicare benefits to 3 organizations: Hopewell Health Centers Inc (Athens, OH), Hocking Valley Community Hospital (Logan, OH) and Hocking Valley Medical Group, Inc. (Logan, OH). 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 Martin Hammar's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Martin Hammar accept?

Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter from Meridian, Anthem Blue Cross and Blue Shield and Antidote Health Plan of Ohio, Inc. and 6 other insurers list Martin Hammar 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 Martin Hammar affiliated with any hospitals?

According to CMS data, Martin Hammar is affiliated with Hocking Valley Community Hospital.

When was this NPI record last updated?

The NPPES record for Martin Hammar was last updated on November 12, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.