What is William Martin's NPI number?

William Martin's National Provider Identifier (NPI) is 1891861829, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is William Martin's specialty?

William Martin is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).

Where is William Martin located?

William Martin's practice location on file with NPPES is 11400 Overseas Hwy Ste 224, Marathon, FL 33050-3600.

What is William Martin's phone number?

The practice phone number listed in the NPPES registry for William Martin is (305) 906-0238.

Does William Martin accept Medicare?

William Martin is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.

Is William Martin's NPI active?

Yes — William Martin's NPI (1891861829) is active in the NPPES registry as of the last update on 2013-04-17.

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William Martin, LCSW

NPI 1891861829 · Clinical Social Worker · Marathon, FL

William Martin, LCSW is a Clinical Social Worker provider in Marathon, FL (NPI 1891861829).

Provider details

NPI number: 1891861829
Entity type: Individual
Primary specialty: Clinical Social WorkerBehavioral Health & Social Service Providers
Credential: LCSW
Sex: Male
Sole proprietor: No
License: SW 6660 (FL)

Practice location

11400 Overseas Hwy Ste 224

Marathon, FL 33050-3600

Phone: (305) 906-0238

Fax: (305) 434-9040

Street-level locationGet directions

More FL providers

Mailing address

11400 Overseas Hwy Ste 224

Marathon, FL 33050-3600

Specialties & taxonomies

Clinical Social WorkerPrimary1041C0700XLicense SW 6660 (FL)
Behavioral Health & Social Service Providers
Clinical Social Worker1041C0700XLicense LCS 21181 (CA)
Behavioral Health & Social Service Providers

Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)

Profile Score

Detailed profile(90/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure28% of score
19 yrs in NPPES registry
Profile completeness28% of score
100% of core fields populated
Practice footprint17% of score
1 documented practice location
Medicare service volume (vs. specialty peers)28% of score
512 Medicare services, 2024 (ranked within specialty)

Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.

What this provider does (Medicare)

Based on Medicare fee-for-service claims, 2024; not all care is captured.

Service (HCPCS)	Medicare services	Typical Medicare-allowed (2024)
Psychotherapy, 1 Hour90837	512	$116

Typical Medicare-allowed amounts for these services range $116–$116 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.

Enumerated: 2006-11-28
Last updated: 2013-04-17

Frequently asked questions

What is William Martin's NPI number?: William Martin's National Provider Identifier (NPI) is 1891861829, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
What is William Martin's specialty?: William Martin is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
Where is William Martin located?: William Martin's practice location on file with NPPES is 11400 Overseas Hwy Ste 224, Marathon, FL 33050-3600.
What is William Martin's phone number?: The practice phone number listed in the NPPES registry for William Martin is (305) 906-0238.
Does William Martin accept Medicare?: William Martin is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
Is William Martin's NPI active?: Yes — William Martin's NPI (1891861829) is active in the NPPES registry as of the last update on 2013-04-17.

Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.

Provider details

Practice location

Mailing address

Specialties & taxonomies

Profile Score

What this provider does (Medicare)

Registry dates

Frequently asked questions

Specialties & taxonomies

Frequently asked questions

Profile Score

What this provider does (Medicare)