DR. BRETT STOCKTON KATHMANN M.D.
NPI 1851666150
Emergency Medicine - Undersea and Hyperbaric Medicine in Gulfport, MS

Q: What is Brett Kathmann's NPI number?

The NPI number for Brett Kathmann is 1851666150. It was assigned to this individual provider in the NPPES registry on March 20, 2012.

Q: What is Brett Kathmann's specialty?

The primary specialty registered for this NPI is Emergency Medicine, specializing in Undersea and Hyperbaric Medicine, with taxonomy code 207PE0005X.

Q: When was this NPI record last updated?

The NPPES record for Brett Kathmann was last updated on May 19, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.

Active since March 20, 2012PECOS EnrolledAccepts Medicare Assignment

93.1/100

CMS Quality Rating

4500 13TH ST, GULFPORT, MS 39501(228) 493-4325(228) 200-5691 Get Directions Write a Review

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

Record update history: May 19, 2026, Nov 14, 2016 (2 updates tracked since 2016).

On this page

About Dr. Brett Stockton Kathmann M.d. NPPES

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

DR. BRETT STOCKTON KATHMANN M.D. (NPI 1851666150) is an individual undersea and hyperbaric medicine provider in Gulfport, Mississippi, licensed in Mississippi (24612) and active in the NPI registry since March 2012. He is enrolled in Medicare PECOS, is affiliated with Merit Health Biloxi, and is a graduate of Other (2012).

NPPES Registry Identity

NPI1851666150

Entity TypeIndividualMale

Primary Taxonomy207PE0005X

Provider Legal NameDR. BRETT STOCKTON KATHMANNCredential: M.D.

Location Address4500 13TH STGulfport, MS 39501-2515

Mailing AddressPo Box 6266Gulfport, MS 39506-6266 · (228) 865-1330 · Fax (228) 865-1331

Phone(228) 493-4325

Fax(228) 200-5691

Sole ProprietorNo

Medical School CMSOtherGraduated 2012

Enumeration DateMarch 20, 2012

Last NPPES UpdateMay 19, 20262 updates tracked since enumeration

NPPES CertifiedMay 19, 2026

✔ NPI 1851666150 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyEmergency Medicine · Undersea and Hyperbaric MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207PE0005X

License✔ Licensed in MS · 24612

Definition

A specialist who treats decompression illness and diving accident cases and uses hyperbaric oxygen therapy to treat such conditions as carbon monoxide poisoning, gas gangrene, non-healing wounds, tissue damage from radiation and burns, and bone infections. This specialist also serves as a consultant to other physicians in all aspects of hyperbaric chamber operations, and assesses risks and applies appropriate standards to prevent disease and disability in divers and other persons working in altered atmospheric conditions.

Also ListedEmergency MedicineTaxonomy 207P00000X · License 24612 (MS), MD.207434 (LA)

4500 13TH ST, Gulfport, MS 39501

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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, 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

Dr. Brett Stockton Kathmann M.d. 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 ID143528695

PECOS Enrollment IDI20170207001597

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

Medicare enrollment records show Brett Kathmann reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Coastal Wound Specialists LLC

Same address

Undersea and Hyperbaric Medicine

4500 13TH ST
Gulfport, MS 39501

Reassigned Medicare billing, Mississippi enrollment
2 clinicians in this Medicare group

NPI 1336014612 (228) 865-1330

Memorial Hospital At Gulfport

Same address

General Acute Care Hospital

4500 13TH ST
Gulfport, MS 39501

Reassigned Medicare billing, Mississippi enrollment
731 clinicians in this Medicare group

NPI 1073606901 (228) 867-3076

Care Doc LLC

0.1 mi

Internal Medicine

4500 13TH ST
Gulfport, MS 39501

Reassigned Medicare billing, Mississippi enrollment
34 clinicians in this Medicare group

NPI 1225505993 (228) 256-1831

Gulf Coast Wound Associates LLC

16 mi

Wound Care

5427 GEX RD
Diamondhead, MS 39525

Reassigned Medicare billing, Mississippi enrollment
15 clinicians in this Medicare group

NPI 1467118448 (228) 255-4832

Van Meter Emergency Physicians Inc. Apmc

58 mi

Emergency Medicine

95 E FAIRWAY DR
Covington, LA 70433

Reassigned Medicare billing, Louisiana enrollment
159 clinicians in this Medicare group

NPI 1649410697 (985) 867-4000

Gulf South Wound Care LLC

331 mi

Undersea and Hyperbaric Medicine

6019 WALNUT GROVE RD
Memphis, TN 38120

Reassigned Medicare billing, Mississippi and Tennessee enrollments
7 clinicians in this Medicare group

NPI 1720877376 (228) 865-1330

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 16

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.

Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222

Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.

755 services603 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

597 services283 patients

Management of oxygen chamber therapy 99183

Oxygen chamber therapy involves breathing pure oxygen in a pressurized room or tube. It's used to treat various conditions like wounds that won't heal due to diabetes or radiation injury. In this therapy, your body's tissues get more oxygen to promote healing and fight infection.

364 services27 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

328 services189 patients

Emergency department visit with high level of medical decision making 99285

An emergency department visit for severe conditions is when you urgently seek medical help due to serious health issues. These could be severe injuries, breathing problems, unbearable pain, or sudden severe illness. Doctors and nurses will provide immediate care to stabilize your condition.

151 services148 patients

Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes 99221

Initial hospital inpatient care refers to the first day of your stay in the hospital. This service typically includes a 30-minute check-up with a healthcare professional. They'll assess your health, discuss your condition, and plan your treatment. It's part of ensuring you receive the best possible care.

106 services104 patients

Removal of skin and tissue, 20.0 sq cm or less 11042

This procedure involves the surgical removal of skin and tissue, up to 20.0 square cm in size. It's often performed to treat conditions like skin cancer or to remove moles, warts, and other skin lesions. The area is numbed and the unwanted tissue is carefully cut out.

105 services66 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.

71 services69 patients

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.

68 services68 patients

Emergency department visit with moderate level of medical decision making 99284

An emergency department visit for a high-severity issue means you're experiencing a serious health problem that needs immediate attention. This could be a severe injury, serious illness, or life-threatening condition. Medical professionals will provide urgent care to stabilize your condition.

66 services66 patients

Application of skin substitute graft to wound of trunk, arms, or legs, 25.0 sq cm or less of wound 100.0 sq cm or less 15271

This procedure involves applying a skin substitute graft to a wound on the trunk, arms, or legs. The graft, a lab-grown skin, is used to cover a wound area of 25.0 sq cm or less, within a total wound area of 100.0 sq cm or less. It aids in healing and regeneration.

53 services26 patients

Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more 99212

This is a routine check-up for patients who have previously seen the doctor. During this 10-19 minute visit, the doctor will review your health status, discuss any concerns, and manage ongoing treatments or medications. It's a chance to ensure your health is on track.

28 services27 patients

Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and G0180

This is a service where a doctor or authorized practitioner certifies that you require Medicare-covered home health services. They will communicate with the home health agency and review reports on your health status to ensure you receive appropriate care. This does not involve an in-person visit.

17 services16 patients

Physician or allowed practitioner re-certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians a G0179

This procedure involves a doctor or approved practitioner reviewing your health status and re-certifying your need for Medicare-covered home health services. It includes communication with the home health agency and assessment of your health reports, even when you're not physically present.

15 services12 patients

Preparation of skin graft site of trunk, arms, or legs, 100.0 sq cm or 1% body area for infants and children, or less 15002

This procedure involves preparing a specific area of the body (trunk, arms, or legs) for a skin graft. The area is cleaned and any dead tissue is removed to ensure a successful graft. The procedure covers an area of 100.0 sq cm or 1% of a child's body.

13 services13 patients

Emergency department visit with low level of medical decision making 99283

An emergency department visit for a problem of moderate severity involves immediate medical attention for issues like minor fractures, burns, or high fever. The healthcare team will assess your condition, provide necessary treatment, and may suggest further tests or admission if required.

13 services13 patients

Hospital Affiliations CMS Care Compare 3

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

Merit Health Biloxi

Acute Care Hospitals · Biloxi, MS

2/5 CMS rating

OwnershipProprietary

CMS Certification Number250007

Location150 Reynoir StreetBiloxi, MS 39530 · Harrison County

Emergency services Birthing friendly

Memorial Hospital At Gulfport

Acute Care Hospitals · Gulfport, MS

2/5 CMS rating

OwnershipGovernment - Local

CMS Certification Number250019

Location4500 13th StreetGulfport, MS 39502 · Harrison County

Emergency services Birthing friendly

Singing River Gulfport

Acute Care Hospitals · Gulfport, MS

1/5 CMS rating

OwnershipProprietary

CMS Certification Number250123

Location15200 Community RoadGulfport, MS 39503 · Harrison County

Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 39501 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

$80.50 typical visit price

range $51.65 – $159.18

Typical copayment $20.12 (range $12.91 – $39.79)

Most-billed visit code 99203

Established Patient

$92.20 typical visit price

range $16.15 – $129.61

Typical copayment $23.05 (range $4.03 – $32.40)

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.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

93.1/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored through an Alternative Payment Model

Quality

83.08

Promoting Interoperability

Improvement Activities

Referred Medical Equipment & Supplies CMS DME claims 3

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Ostomy skin barrier, solid 4 x 4 or equivalent, extended wear, without built-in convexity, each A4385

DME-Orthotic Devices · category DF010N

1 supplier11 claims220 services$4.92 avg. paid by Medicare

Ostomy skin barrier, with flange (solid, flexible, or accordion), extended wear, with built-in convexity, 4 x 4 inches or smaller, each A4407

DME-Orthotic Devices · category DF010N

1 supplier11 claims220 services$8.46 avg. paid by Medicare

Ostomy pouch, drainable; for use on barrier with non-locking flange, with filter (2 piece system), each A4425

DME-Orthotic Devices · category DF010N

1 supplier11 claims220 services$3.46 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

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.

HEATHER LYN JEFFREY

Nurse Practitioner