Mark Klein, MD
NPI 1376628529 · Nephrology Physician · Flowood, MS
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Klein, MD is a Nephrology Physician provider in Flowood, MS (NPI 1376628529).
Provider details
- NPI number
- 1376628529
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 15985 (MS)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,336 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Dialysis Services, 4 Or More Physician Visits Per Month (20 Years Or Older)90960 | 269 | $315 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 188 | $109 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 162 | $73 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 159 | $89 |
| Use of a Drug to Induce Depression of Consciousness By Physician Performing a Procedure (5 Years Or Older), Initial 15 Minutes99152 | 99 | $11 |
| Insertion of Needle And/Or Tube Into Hemodialysis Circuit and Balloon Dilation of Dialysis Segment With Review By Radiologist |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 41 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Furosemide | 123 | 39 |
| Losartan Potassium | 120 | 37 |
| Ferric Citratebrand: Auryxia | 111 | 17 |
| Sevelamer Carbonate | 103 | 25 |
| Carvedilol | 77 | 23 |
| Amlodipine Besylate | 76 | 24 |
| Ergocalciferol (vitamin D2)brand: Vitamin D2 | 68 | 18 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$466 across 20 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 1010 Lakeland Square Ext Ste BFlowood, MS 39232-7607Phone: (601) 936-0890Fax: (601) 936-0891
Registry dates
- Enumerated
- 2006-10-26
- Last updated
- 2026-05-19
- Certified
- 2026-05-19
Frequently asked questions
- What is Mark Klein's NPI number?
- Mark Klein's National Provider Identifier (NPI) is 1376628529, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Klein's specialty?
- Mark Klein is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Klein located?
- Mark Klein's practice location on file with NPPES is 102 Riverview Dr Ste a, Flowood, MS 39232-8908.
- What is Mark Klein's phone number?
- The practice phone number listed in the NPPES registry for Mark Klein is (601) 981-1610.
- Does Mark Klein accept Medicare?
- Mark Klein is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Klein's NPI active?
- Yes — Mark Klein's NPI (1376628529) is active in the NPPES registry as of the last update on 2026-05-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.