1. Home
  2. Directory
  3. Tennessee
  4. Chattanooga
  5. Internal Medicine
  6. NPI Profile

ELWYN C CLARK DO
NPI 1083875900
Internal Medicine - Critical Care Medicine in Chattanooga, TN

Active since June 23, 2008PECOS EnrolledAccepts Medicare Assignment
979 E 3RD ST STE C735, CHATTANOOGA, TN 37403(423) 778-9101 Get Directions Write a Review

NPPES record last updated: July 6, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Elwyn C Clark Do NPPES

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

ELWYN C CLARK DO (NPI 1083875900) is an individual critical care medicine provider in Chattanooga, Tennessee, licensed in New York (247501-1) and active in the NPI registry since June 2008. He is enrolled in Medicare PECOS, is affiliated with Erlanger Medical Center, and is a graduate of Other (2004).

NPPES Registry Identity

NPI1083875900
Entity TypeIndividualMale
Primary Taxonomy207RC0200X
Provider Legal NameELWYN C CLARKCredential: DO
Location Address979 E 3RD ST STE C735Chattanooga, TN 37403-3310
Mailing Address1629 Sawyer Spring TrlSignal Mountain, TN 37377-1632 · (917) 685-1189
Phone(423) 778-9101
Sole ProprietorNo
Medical School CMSOtherGraduated 2004
Enumeration DateJune 23, 2008
Last NPPES UpdateJuly 6, 2026
NPPES CertifiedJuly 6, 2026
✔ NPI 1083875900 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Critical Care MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207RC0200X
License✔ Licensed in NY · 247501-1
Definition
An internist who diagnoses, treats and supports patients with multiple organ dysfunction. This specialist may have administrative responsibilities for intensive care units and may also facilitate and coordinate patient care among the primary physician, the critical care staff and other specialists.
Also ListedEmergency MedicineTaxonomy 207P00000X · License 247501 (NY)
979 E 3RD ST STE C735, Chattanooga, TN 37403
Open in Google Maps ↗

Other Identifiers 3

Other3966TN · License
Other81095GA · License
Other247501NY · License

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

Elwyn C Clark Do 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 ID3577636018
PECOS Enrollment IDI20200820001184
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

4

Medicare enrollment records show Elwyn Clark reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Erlanger Health
Same address
Internal Medicine
979 E 3RD ST STE A440
Chattanooga, TN 37403
  • Reassigned Medicare billing, Tennessee enrollment
  • 679 clinicians in this Medicare group
NPI 1477256303 (423) 778-2867
Chattanooga Hamilton County Hospital Authority
0.1 mi
Internal Medicine
975 E 3RD ST
Chattanooga, TN 37403
  • Reassigned Medicare billing, Tennessee enrollment
  • 533 clinicians in this Medicare group
NPI 1407034028 (423) 266-1490
Hamilton Medical Center, Inc.
25 mi
General Acute Care Hospital
1200 MEMORIAL DR
Dalton, GA 30720
  • Reassigned Medicare billing, Georgia enrollment
  • 236 clinicians in this Medicare group
NPI 1528056066 (706) 272-6000
Bradley Physician Services, LLC
25 mi
Orthopaedic Surgery of the Spine
2305 CHAMBLISS AVE NW
Cleveland, TN 37311
  • Reassigned Medicare billing, Tennessee enrollment
  • 88 clinicians in this Medicare group
NPI 1710727540 (423) 728-1650

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.

Critical care, first 30-74 minutes 99291
Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.
191 services89 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
62 services43 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
50 services49 patients
Hospital discharge day management, more than 30 minutes 99239
Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.
25 services24 patients

Hospital Affiliations CMS Care Compare

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

Erlanger Medical Center

Acute Care Hospitals · Chattanooga, TN
2/5 CMS rating
OwnershipGovernment - Hospital District or Authority
CMS Certification Number440104
Location975 E 3rd StChattanooga, TN 37403 · Hamilton County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 37403 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
$121.80 typical visit price
range $52.64 – $160.89
Typical copayment $30.45 (range $13.16 – $40.22)
Most-billed visit code 99204
Established Patient
$93.60 typical visit price
range $16.72 – $131.41
Typical copayment $23.40 (range $4.18 – $32.85)
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 4

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

ANNE MAINARDI M.D.
Internal Medicine (Pulmonary Disease)
979 E 3RD ST STE C735
CHATTANOOGA, TN 37403
Hamilton County (423) 778-9101
ADAM ISAAC HUMPHREY PA-C
Physician Assistant (Medical)
979 E 3RD ST STE C735
CHATTANOOGA, TN 37403
Hamilton County (423) 778-9101
JEREMY ADAM GREENBERG M.D.
Internal Medicine (Critical Care Medicine)
979 E 3RD ST STE C735
CHATTANOOGA, TN 37403
Hamilton County (423) 778-9101
RADHIKA SHAH M.D.
Internal Medicine (Pulmonary Disease)
979 E 3RD ST STE C735
CHATTANOOGA, TN 37403
Hamilton County (423) 778-9101

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 Elwyn Clark's NPI number?

The NPI number for Elwyn Clark is 1083875900. It was assigned to this individual provider in the NPPES registry on June 23, 2008.

Where is Elwyn Clark located?

Elwyn Clark practices at 979 E 3rd St Ste C735, Chattanooga, TN 37403. The listed phone number is (423) 778-9101.

What is Elwyn Clark's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.

Is Elwyn Clark enrolled in Medicare?

Yes. Elwyn Clark 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 Elwyn Clark's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Elwyn Clark reassigns Medicare benefits to 4 organizations: Erlanger Health (Chattanooga, TN), Chattanooga Hamilton County Hospital Authority (Chattanooga, TN), Hamilton Medical Center, Inc. (Dalton, GA) and Bradley Physician Services, LLC (Cleveland, TN). 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 Elwyn Clark's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Elwyn Clark affiliated with any hospitals?

According to CMS data, Elwyn Clark is affiliated with Erlanger Medical Center.

When was this NPI record last updated?

The NPPES record for Elwyn Clark was last updated on July 6, 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.