What is Gustavo Day's specialty?

Gustavo Day (NPI 1538239173) is a Medicare-billing provider whose primary specialty is Internal Medicine in Dallas, TX.

Where does Gustavo Day practice?

Gustavo Day practices in Dallas, TX, based on the location reported in the CMS Medicare provider datasets for NPI 1538239173.

How much does Medicare pay Gustavo Day?

Gustavo Day (NPI 1538239173) received approximately $256K in total Medicare Part B payments, serving 356 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1538239173

Gustavo DayM.D.

Internal MedicineDallas, TXI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

2,693

Unique beneficiaries

—

Total services

6,232

Distinct HCPCS

Medicare payment

$223K

Peer benchmark

Total Medicare services vs. 6,183 Internal Medicine providers in TX — top quintile (cohort median 673).

PRESCRIBING · PART D · 2024

Total Rx claims

33,296

Beneficiaries

—

Total drug cost

$3.7M

Distinct drugs

254

Brand share

26.8%

Top prescribed drugs

Hydrocodone/Acetaminophen1,944 claims

Atorvastatin Calcium1,756 claims

Losartan Potassium1,361 claims

Alprazolam1,033 claims

Gabapentin860 claims

QUALITY · MIPS · 2024

No data available for this provider in 2024.

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

Total received

$5K

Payment records

250

By payment type

Food and Beverage$5K

Top paying entities

Food and Beverage$5K

REFERRAL NETWORK

Where Gustavo Day'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). 7 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
Laboratory Corporation Of America Clinical Laboratory · Dallas, TX	228	503
POSTMA, TOM	16	75
Uday Kanamalla Interventional Radiology · Dallas, TX	13	43
TEXAS HEALTH PRESBYTERIAN HOSPITAL DALLAS	13	38
LANE, BENNIE	12	52
Prabhakar Kesava Diagnostic Radiology · Lynnwood, WA	12	42
Richard Bluestein Emergency Medicine · Dallas, TX	11	33

Refers patients to

Outbound — where patients go next

No outbound pairs above the suppression threshold.

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.

CROSS-REFERENCE

Related data on other Healthparse brands

ProviderScore

OIG/SAM exclusion screening, sanctions history

Healthparse Signals

Monitor this provider for changes — dated NPI change events