Medicare Enrolled
Dr. Dennis Grewal, DO
Cardiovascular Disease · Santa Ana, CA
Practice pattern: Clinical Cardiology
— Primarily office-based clinical cardiology
Low-engagement
Very High
DATA COVERAGE
Data in 4 of 4 federal sources
Measures public federal data availability — not provider quality
Informational, not a quality rating.
This page presents federal public records about Dr. Grewal from CMS (NPPES, Open Payments, Medicare Provider Utilization, PECOS). It is not medical advice, an endorsement, or a judgment of clinical quality. Always consult the provider directly and a licensed clinician for medical decisions. Read methodology →
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What this data tells you about Dr. Grewal
Dr. Dennis Grewal is a cardiovascular disease specialist in Santa Ana, CA, with 10 years of NPI registration. Based on federal Medicare data, Dr. Grewal performed 629 Medicare services across 579 unique beneficiaries.
Between the years covered by Open Payments, Dr. Grewal received a total of $3,901 from 18 pharmaceutical and/or device companies across 44 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in cardiovascular disease. Most payments are for meals and travel — low-value interactions common across virtually all practicing physicians. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Grewal is Very High — reflecting how much public federal data is available about this provider. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
✓ 10 years in practice
▲ 629 Medicare services
$3,901 industry payments
Medicare Practice Summary
Medicare Utilization ↗629
Medicare services
Bottom 24% in CA for cardiovascular disease
Lower Medicare volume may reflect subspecialty focus, hospital-based work, or a higher share of non-Medicare patients.
579
Unique beneficiaries
$62
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~63 Medicare services per year of practice
Top procedures by volume
Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.
| Procedure | Volume | Avg. paid | Avg. submitted |
|---|---|---|---|
| Office visit, established patient (30-39 min) A follow-up office visit for an existing patient lasting between 30 and 39 minutes. The visit involves medical evaluation and management of the patient's condition. |
79 | $99 | $263 |
| External EKG monitoring, 8-15 days Continuous external electrocardiogram recording and review over a period of 8 to 15 days to monitor heart rhythm. |
58 | $20 | $80 |
| Electrocardiogram (EKG), 12-lead A standard heart rhythm test using at least 12 leads to record electrical activity. A healthcare provider interprets the results and provides a written report. |
52 | $11 | $70 |
| New patient office visit (45-59 min) An initial office visit for a new patient lasting between 45 and 59 minutes. This code covers the total time spent by the physician or qualified healthcare professional on the date of the encounter. |
40 | $119 | $432 |
| Initial hospital admission, moderate complexity Initial hospital inpatient or observation care for a new patient involving moderate-level medical decision making, with at least 55 minutes total time on the date of the encounter. |
39 | $105 | $400 |
| Transesophageal echocardiogram An ultrasound of the heart performed using a probe inserted into the esophagus to obtain detailed images of heart structures and function. |
35 | $86 | $350 |
| Office visit, established patient (20-29 min) An office visit for an existing patient lasting between 20 and 29 minutes. The visit involves medical evaluation and management of the patient's condition. |
35 | $71 | $110 |
| Hospital follow-up visit, moderate complexity Follow-up hospital visit for an existing patient involving moderate medical decision making. The visit requires at least 35 minutes of time spent on the date of service. |
34 | $64 | $215 |
| Sedation by physician, initial 15 minutes Administration of a drug to induce depression of consciousness by the physician performing a procedure. This code covers the initial 15 minutes of sedation for patients aged 5 years or older. |
32 | $10 | $165 |
| New patient office visit (30-44 min) An initial office visit for a new patient lasting between 30 and 44 minutes. This code is used when the total time spent on the date of the encounter falls within this range. |
24 | $86 | $217 |
| 3D ultrasound of heart for congenital heart defects This procedure uses three-dimensional ultrasound imaging to evaluate the structure of the heart during an assessment for congenital heart defects. |
23 | $19 | $190 |
| Heart muscle strain imaging | 21 | $8 | $130 |
| Continuous EKG monitoring review, 48-7 days Review and interpretation of continuous external EKG recordings lasting more than 48 hours up to 7 days. |
19 | $19 | $70 |
| Echocardiogram, transthoracic An ultrasound of the heart that uses color to show blood flow, rate, direction, and valve function. |
18 | $136 | $416 |
| Hospital discharge management, 30+ min This service covers the care provided by a physician or qualified healthcare professional on the day a patient is discharged from the hospital. It requires more than 30 minutes of total time spent on the day of discharge. |
17 | $93 | $310 |
| Exercise or drug-induced heart stress test with ECG A heart stress test performed using exercise or medication while an electrocardiogram is monitored under physician supervision. |
16 | $14 | $100 |
| Exercise or drug-induced heart stress test with ECG A heart stress test performed using exercise or medication while monitoring the electrocardiogram, with physician review of the results. |
16 | $9 | $75 |
| Follow-up heart ultrasound An ultrasound of the heart performed to monitor or reassess a previously identified condition or treatment progress. |
14 | $20 | $140 |
| Stress echocardiogram with ECG monitoring An ultrasound of the heart performed while monitoring heart rhythm during rest, exercise, or medication-induced stress, followed by a review and report of the findings. |
12 | $191 | $253 |
| Transesophageal echocardiogram during heart surgery An ultrasound of the heart performed using a probe inserted into the esophagus while surgery on the heart or major blood vessels is taking place, including a written report. |
12 | $178 | $710 |
| Echocardiogram, transthoracic An ultrasound test that uses sound waves to create images of the heart's blood flow, valves, and chambers. |
11 | $42 | $53 |
| Follow-up ultrasound of heart blood flow, valves and chambers An ultrasound exam that follows up on the heart's blood flow, valves, and chambers. It uses sound waves to create images of the heart's structure and function. |
11 | $6 | $25 |
| Echocardiogram with color Doppler An ultrasound of the heart that uses color imaging to visualize blood flow, measure flow rate, and assess valve function. |
11 | $19 | $25 |
How to read this data: This reflects Medicare patients only (typically 65+). Payment amounts are what Medicare paid the provider, not your out-of-pocket cost. A higher procedure volume generally indicates more experience with that procedure.
8.3% high complexity
23.5% medium
68.2% routine
Industry Payment Transparency
Open Payments through 2024 ↗$3,901
Total received (2018-2024)
Avg $557/year across 7 years
Top 46% in CA for cardiovascular disease
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
18
Companies
44
Individual payments
All payments are legal and publicly reported · Not evidence of wrongdoing · How to interpret →
Payment profile
Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.
Meals & Travel
Food, beverages, travel, and lodging — typically low-value
$3,901 (100.0%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$1,718
2023
$1,117
2022
$372
2021
$376
2020
$15
2019
$93
2018
$209
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
ShockWave Medical, Inc
$933
Penumbra, Inc.
$474
BIOTRONIK INC.
$147
ZOLL Services LLC (A/K/A ZOLL LifeCor Corp)
$94
Abbott Laboratories
$49
Janssen Pharmaceuticals, Inc
$20
Top 3 companies account for 90.5% of 2024 payments
All-time payments by company (2018-2024) ›
Abbott Laboratories
$1,177
ShockWave Medical, Inc
$933
Penumbra, Inc.
$575
BIOTRONIK INC.
$279
Medtronic, Inc.
$153
ZOLL Services LLC (A/K/A ZOLL LifeCor Corp)
$149
Kiniksa Pharmaceuticals, Ltd.
$135
Bayer HealthCare Pharmaceuticals Inc.
$125
Novartis Pharmaceuticals Corporation
$115
Philips Electronics North America Corporation
$103
Boston Scientific Corporation
$43
Otsuka America Pharmaceutical, Inc.
$23
Janssen Pharmaceuticals, Inc
$20
iRhythm Technologies, Inc.
$19
Allergan Inc.
$14
Medtronic Vascular, Inc.
$14
E.R. Squibb & Sons, L.L.C.
$12
PFIZER INC.
$12
Top 3 companies account for 68.8% of all-time payments
Associated products mentioned in payments ›
(7881) US Und · AVYCAZ · Acticor 7 VR-T DX · Azure · Bioprosthetic Mitral Valve · CardioMEMS HF System · ELIQUIS · Indigo System · JADENU · Kerendia · LifeVest · MITRACLIP · Micra · SAMSCA · SELECTSECURE · Selectra · Shockwave IVL System with the Shockwave C2 Coronary IVL Catheter · WATCHMAN · XARELTO · ZIO XT Patch
Should you be concerned? Payments from pharmaceutical and device companies are legal and common — 57% of U.S. physicians receive at least one. They often reflect legitimate consulting, research, or education. What matters is whether a recommended drug or device appears in your doctor's payment records. If so, consider asking your doctor about it. How to interpret this data →
Most payments (100%) are for meals and travel — low-value interactions that are common across virtually all practicing physicians.
Geographic Context
Cardiologists within 10 mi
288
Per 100K population
9.1
County median income
$113,702
Nearest hospital
ORANGE COUNTY GLOBAL MEDICAL CENTER
0.0 mi
0.0 mi
Data Sources
| Provider Registry | ✓ NPPES | Weekly updates |
| Medicare Enrollment | ✓ PECOS | Monthly updates |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not public | N/A |
This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This reflects how much public data is available about a provider. How we calculate this →
Summary
Dr. Grewal is a clinical cardiology specialist, with moderate Medicare volume, with low-engagement industry engagement.
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
Is Dr. Grewal experienced with office visit, established patient (30-39 min)?
Based on Medicare claims data, Dr. Grewal performed 79 office visit, established patient (30-39 min) services. Research suggests that higher procedure volume is often associated with better outcomes, particularly for complex procedures. Note that Medicare data only captures patients aged 65 and older, so the total practice volume across all patients is likely higher.
Does Dr. Grewal receive payments from pharmaceutical companies?
Yes. Dr. Grewal received a total of $3,901 from 18 companies across 44 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common among physicians — 57% of all U.S. physicians receive at least one industry payment. Patients may wish to ask their doctor about these relationships, especially if a recommended drug or device appears in the payment records.
How do Dr. Grewal's costs compare to other cardiologists in Santa Ana?
Dr. Grewal's average Medicare payment per service is $62. Note that these figures represent what Medicare pays, not your out-of-pocket cost, which depends on your specific insurance plan and deductible. Procedure-level data above shows both what was submitted and what Medicare paid for each service type.
What does Data Coverage mean?
Data Coverage (currently Very High for Dr. Grewal) measures how much public federal data is available about a provider. It is not a quality rating. A "Very High" or "High" level means the provider has data across multiple federal sources (NPPES, PECOS, Medicare Utilization, Open Payments), indicating a long track record of practice, Medicare participation, and industry disclosure. A "Low" or "Moderate" level may simply mean the provider is newer, does not see Medicare patients, or has not received any industry payments — none of which are inherently negative. Read our full methodology →
Is this data up to date?
Each data source has its own update cycle. Provider registry data (NPPES) is updated weekly. Medicare enrollment (PECOS) is updated monthly. Medicare practice data has a ~2 year lag — the most recent available is typically 2 years prior. Industry payment data (Open Payments) is published annually, usually in June, covering the prior calendar year. We display the data date prominently on each section so you always know how current it is. See our data freshness policy →
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About this page
All data on this page is sourced verbatim from public federal records published by the U.S. Centers for Medicare & Medicaid Services (CMS): NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.
This page is not medical advice, an endorsement, a recommendation, or a quality rating. Data Coverage reflects data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.
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