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PROVIDER PROFILE · NPI 1114928793

Mark CastellawMD

Internal MedicineGermantown, TNI
CROSS-REFERENCE

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ProviderScore
OIG/SAM exclusion screening, sanctions history
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QUALITY · MIPS · 2024
Final MIPS score
81.9
Quality
64.8
Cost
74.8
Improvement activities
40.0
Promoting interop.
100.0
Payment adjustment
0.29%
Group
FACILITY AFFILIATIONS

Hospital & Facility Affiliations (10)

CCN 447124
Home health agency
CCN 447213
Home health agency
CCN 447263
Home health agency
CCN 447402
Home health agency
CCN 447407
Home health agency
CCN 250141
Hospital
CCN 440048
Hospital
CCN 440049
Hospital
CCN 440131
Hospital
CCN 440183
Hospital
PRESCRIBING · PART D · 2024
Total Rx claims
12,077
Beneficiaries
—
Total drug cost
$926K
Distinct drugs
131
Brand share
19.0%
Top prescribed drugs
Amlodipine Besylate591 claims
Atorvastatin Calcium537 claims
Levothyroxine Sodium535 claims
Losartan Potassium502 claims
Rosuvastatin Calcium494 claims
INDUSTRY PAYMENTS · OPEN PAYMENTS · 2024
Total received
$551
Payment records
28
By payment type
Food and Beverage$551
MEDICARE UTILIZATION · PART B · 2024
Total beneficiaries
11,470
Unique beneficiaries
—
Total services
19,997
Distinct HCPCS
67
Medicare payment
$481K
Peer benchmark
Q1
Q2
Q3
Q4
Q5
Total Medicare services vs. 1,907 Internal Medicine providers in TN — top quintile (cohort median 791).
REFERRAL NETWORK

Where Mark Castellaw's patients come from & go

Directional shared-patient flow from Medicare claims — who sends patients to this provider (inbound) and where this provider's patients go next (outbound). 26 inbound referrers · 65 outbound destinations.

Receives referrals from
Inbound — who sends patients here
PhysicianPatientsVisits
Paul Tanner
Diagnostic Radiology · Memphis, TN
3331,554
Randy Horras
Diagnostic Radiology · Memphis, TN
95248
Steven Gubin
Cardiology · Memphis, TN
40172
David Iansmith
Cardiology · Memphis, TN
2993
WARR, OTIS2758
Daniel Craven
Diagnostic Radiology · Memphis, TN
2796
Laboratory Corporation Of America Holdings
Clinical Laboratory · Birmingham, AL
2587
Ellis Reef
Cardiology · Memphis, TN
2563
Steven Wener
Internal Medicine · Germantown, TN
2498
Arnel Pallera
Hematology-Oncology · Germantown, TN
22255
John Ellzey
Diagnostic Radiology · Memphis, TN
2073
Ray Allen
Interventional Cardiology · Germantown, TN
17113
Refers patients to
Outbound — where patients go next
PhysicianPatientsVisits
Memphis Pathology Laboratory
Clinical Laboratory · Memphis, TN
4392,669
THOMAS, LLOYD2511,157
BAPTIST MEMORIAL HOSPITAL227828
Randy Horras
Diagnostic Radiology · Memphis, TN
209940
Paul Tanner
Diagnostic Radiology · Memphis, TN
122304
METHODIST HEALTHCARE - MEMPHIS HOSPITALS119372
Mohamed Bashar Shala
Cardiology · Memphis, TN
56344
Steven Gubin
Cardiology · Memphis, TN
55324
Anthony Patterson
Urology · Memphis, TN
36110
Craig Lipman
Diagnostic Radiology · Memphis, TN
34149
Ellis Reef
Cardiology · Memphis, TN
3499
David Iansmith
Cardiology · Memphis, TN
33145
Source: CMS Physician Shared Patient Patterns (30-day window, Medicare FFS). Direction = a beneficiary seen by the first provider, then the second, within 30 days; a proxy for referral, not a documented referral. Pairs with fewer than 11 shared beneficiaries are suppressed.