⚠️

Risk scores are statistical indicators based on prescribing patterns compared to specialty peers. They are NOT allegations of fraud, misconduct, or improper care. Many legitimate medical reasons can explain outlier prescribing.

Read our methodology →

Mark CastellawMD

Internal Medicine · Germantown, TN 38138

NPI: 1114928793

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15

🟡 Moderate

Risk Flags

Elevated antipsychotic prescribing (65+)Opioid + benzodiazepine co-prescriber

Risk indicators are statistical patterns, not allegations. Learn more

12,791

Total Claims

$1.0M

Drug Cost

847

Beneficiaries

$1,228

Cost/Patient

Risk Score Breakdown 15/100

Low (0)Moderate (15)Elevated (30)High (50+)
Opioid + benzodiazepine combo+8
Elderly antipsychotic prescribing+5

Score components are additive. Read full methodology

Peer Comparison vs. 110,156 Internal Medicine providers

-24%

Opioid rate vs peers

1.7% vs 2.2% avg

-13%

Cost per patient vs peers

$1,228 vs $1,411 avg

+8%

Brand preference vs peers

11.5% vs 10.6% avg

⚠️ Opioid + Benzodiazepine Co-Prescriber

This provider prescribes both opioids and benzodiazepines. The FDA has issued a Black Box Warning about the life-threatening risks of concurrent use.

🔎 Data Overview

⚠️

This provider co-prescribes opioids and benzodiazepines — a combination carrying an FDA Black Box Warning due to increased risk of respiratory depression and death. While sometimes clinically necessary, this combination requires careful justification.

Insights generated from CMS data analysis. Statistical patterns are not accusations — always consider clinical context.

Opioid Prescribing

1.7%

Opioid Rate

218

Opioid Claims

$1,142

Opioid Cost

Long-Acting Rate

Brand vs Generic

89% generic

Brand: 1,455 claims · $851K

Generic: 11,225 claims · $184K

Top Prescribed Drugs

Drug (Generic)ClaimsCost
Semaglutide133$154K
Tirzepatide70$88K
Apixaban75$78K
Dulaglutide36$61K
Sitagliptin Phosphate44$50K
Insulin Glargine,hum.Rec.Anlog53$46K
Empagliflozin40$39K
Insulin Glargine,hum.Rec.Anlog28$29K
Insulin Degludec22$27K
Insulin Detemir31$24K
Insulin Degludec33$21K
Insulin Aspart15$20K
Sitagliptin Phos/Metformin Hcl20$17K
Dapagliflozin Propanediol21$16K
Linagliptin11$16K

Prescribing Profile

132

Unique Drugs

$203K

IRA Negotiated Drugs

$302K

GLP-1 Drugs

15.0

Anomaly Score

Patient Profile

76

Avg Age

52%

Female

1.15

Avg Risk Score

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Data from CMS Medicare Part D Prescriber Public Use File, 2023. Risk scores are statistical indicators, not allegations of wrongdoing.Methodology · About · Dispute this data