Why are Medicare and Medicaid shown separately instead of combined?

They come from two different CMS data sources with no shared claim identifier, so they can't be reconciled into one number without double-counting or guessing. Every table and chart on this page keeps them fully separate.

Why is there no private/commercial revenue figure?

Private and commercial payer data comes from Transparency in Coverage files, which only publish negotiated rates — not claims or utilization volume. Without a volume figure, no revenue number can be computed for any provider from that data.

What does "Rank" mean in the Competitive Analysis & Benchmarks tables?

For a given CPT/HCPCS code, it's this provider's position by claims volume among all providers billing that same code at that geography level (State, National, or South Dakota for Medicaid) — rank 1 means the highest claims volume for that code.

Why is the Medicaid comparison limited to South Dakota only?

Medicaid is administered per-state with no single national fee schedule, so a state or national comparison the way Medicare has one isn't available. South Dakota (this provider's own state) is the only grouping that's conceptually meaningful.

Why are the numbers rounded to the nearest 10?

To avoid implying more precision than the underlying data supports at a single-provider level. Ratios are kept precise since they're a relative comparison, not a volume or dollar figure.

How current is this data?

The Medicare and Medicaid tables are both single current snapshots, not refreshed on a recurring schedule yet.

Gregory Nissen (NPI 1174813729)

Field	Value
Entity Type	Individual
Organization	Gregory Nissen
Address	3801 S Elmwood Ave
City	Sioux Falls
State	SD
ZIP	57105
Taxonomy	Vascular Surgery Physician
NPI Enumerated	April 17, 2011

Payer Source	Total Paid
Medicare	$467.1K
Medicaid	$0

Key Findings

The provider is effectively a Medicare-focused vascular specialist: lifetime Medicare revenue is $467.1K and there is no Medicaid billing on file, so this profile reflects a single-payer (Medicare) practice footprint rather than a dual-payer mix. The code mix—heavy on endovascular and venous procedures—aligns with the listed taxonomy of Vascular Surgery Physician and suggests procedural-driven revenue rather than a primary-care model.

Revenue concentration is high: the precomputed top three Medicare codes account for 70.3% of this provider’s Medicare revenue, with 37227 generating $201.4K (43.2% of Medicare revenue), 36482 generating $67.9K (14.6%), and 37228 generating $58.7K (12.6%). This concentration indicates that a small set of interventional codes drive the bulk of Medicare income for this clinician.

Business and service-line implications from the top codes point to interventional peripheral vascular work and endovenous therapy: 37227 and 37228 are endovascular codes tied to peripheral arterial interventions, while 36482 (chemical adhesive vein ablation) indicates active treatment of incompetent veins. Supplementary codes—such as 37252 (intravascular ultrasound) and multiple duplex ultrasound codes (93925, 93970, 93976)—show the practice combines image-guided endovascular procedures with noninvasive vascular diagnostics.

Competitive standing by code shows a mixed national footprint: 37228 ranks #65 of 420 providers nationally at the 84th percentile, indicating above-typical volume for that peripheral endovascular code, while 37227 ranks #171 of 363 (50th percentile) and 36482 ranks #259 of 710 (62nd percentile), both described as typical, unremarkable volumes. In short, the provider appears to be a modest national participant overall with stronger relative activity specifically for 37228.

Clinical support and procedure environment are suggested by ancillary codes and volumes: high counts for duplex ultrasound such as 93925 (101 claims, $17.1K, 3.7% of Medicare revenue) and use of intraprocedural imaging 37252 (31 claims, $24K, 5.1%) indicate in-house diagnostic capability and image-guided interventions. Additionally, frequent reporting of procedural sedation monitoring (99152/99153 with 66 and 149 claims respectively, and 99153 accounting for $1.3K) implies routine use of monitored sedation during interventions.

Outpatient evaluation-and-management activity is present but not dominant: 99214 (199 claims, $19.3K, 4.1% of Medicare revenue) and 99213 (165 claims, $11.4K, 2.4%) represent ongoing clinic visits, consistent with pre- and post-procedure vascular care rather than a primary revenue source. These E/M volumes support a practice model centered on procedural throughput with typical levels of clinic follow-up.

Tenure is long enough to establish local presence: the NPI was enumerated on 2011-04-17 (~15 years ago), indicating an established practice with a multi-year billing history to Medicare that can support comparisons over time or peer benchmarking. This duration, combined with the procedural concentration, suggests the provider has built a steady interventional vascular practice rather than a newly established clinic.

There are no Medicaid claims to evaluate, so in-state competitive positioning versus Medicaid peers cannot be assessed from the available data; all payer-comparative observations should therefore be interpreted solely in the Medicare context. The absence of Medicaid billing on file confirms the provider’s practical dependence on Medicare volume and limits conclusions about payer diversification or access for Medicaid populations.

Medicare: Complete Services Breakdown

The CPT/HCPCS codes generating the most Medicare revenue for this provider.

28 rows

CPT/HCPCS Code	Description	Claims	Avg Paid	Revenue
37227	N/A	20	$9,150	$201.4K
36482	In this procedure, the provider inserts a chemical adhesive through a catheter into an incompetent vein in an extremity to ablate the vein. The provider reports this code for treatment of the first…	50	$1,360	$67.9K
37228	N/A	30	$2,350	$58.6K
37252	In this add–on procedure, the provider inserts a specially designed catheter with an ultrasound transducer, a device that sends high–frequency sound waves through the tissues and detects their…	30	$780	$24K
99214	The provider sees an established patient for an office visit or other outpatient visit involving evaluation and management. The visit involves a moderate level of medical decision making, and/or the…	200	$100	$19.3K
93925	The provider performs a duplex ultrasound scan of the lower extremity arteries or bypass grafts on both sides. Providers perform noninvasive arterial diagnostic procedures to examine the rate of…	100	$170	$17.1K
99213	The provider sees an established patient for an office visit or other outpatient visit involving evaluation and management. The visit involves a low level of medical decision making, and/or the…	170	$70	$11.4K
99204	The provider sees a new patient for an office visit or other outpatient visit involving evaluation and management. The visit involves a moderate level of medical decision making, and/or the provider…	80	$130	$9.4K
93970	The provider performs an ultrasound scanning procedure called a duplex scan to characterize the pattern and direction of blood flow in extremity veins (arms or legs). This is a complete, bilateral…	60	$140	$8.4K
93976	The provider performs a duplex scan of a single organ or a limited area of the abdominal, pelvic, scrotal, or retroperitoneal organs. He performs the procedure to examine the vascular supply to the…	60	$120	$6.6K

Showing 1–10 of 28

Medicare: Competitive Analysis & Benchmarks

How this provider's Medicare billing volume and revenue compare to other providers nationally and within its state, across 28 CPT/HCPCS codes.

View: State1 / 2

Claims Volume vs. South Dakota Distribution

Gregory Nissen — 0 of 25 codes billed far more than typical (above p95)

p5–p95 (all providers)p25–p75MedianThis providerOutlier

Rank Distribution — South Dakota

Full comparison — all codes billed, vs. state median

28 rows

CPT/HCPCS Code	Rank	Provider Count	Median Claims	Avg Paid	Average Revenue
37227	3	10	20	$7,300	$270K
36482	3	10	40	$1,210	$64.3K
37252	4	10	30	$570	$27.9K
37228	2	10	20	$1,220	$25.6K
99214	451	1,660	90	$70	$11.4K
93925	7	30	50	$90	$7.7K
99213	407	1,710	80	$50	$6.4K
99204	123	670	30	$100	$5.1K
75710	7	10	30	$90	$4.6K
75630	3	10	30	$120	$3.4K

Showing 1–10 of 28

Related Providers

Other providers that share a Tax Identification Number (TIN) with Gregory Nissen, ranked by combined Medicare and Medicaid revenue.

Provider	State	Taxonomy	Medicare Revenue	Medicaid Revenue
Nathan Steinle	CA	Retina Specialist (Ophthalmology) Physician	$9.5M	$0
Prema Abraham	SD	Retina Specialist (Ophthalmology) Physician	$7.1M	$0
Kyle Thompson	ID	Retina Specialist (Ophthalmology) Physician	$4.5M	$0
Douglas Holmes	WY	Retina Specialist (Ophthalmology) Physician	$4.1M	$0
Mitchell Goff	UT	Retina Specialist (Ophthalmology) Physician	$3.8M	$0
Brendan Girschek	AZ	Ophthalmology Physician	$3.2M	$0
Chad Laurich	SD	Vascular Surgery Physician	$3.2M	$0
NPI 1588636484	—	—	$3.2M	$0
Ryan Geraets	SD	Ophthalmology Physician	$3M	$0
John Bormes	SD	Ophthalmology Physician	$2.6M	$0

Nearby Providers

Other providers in the same ZIP code as Gregory Nissen, ranked by combined Medicare and Medicaid revenue.

Provider	State	Taxonomy	Medicare Revenue	Medicaid Revenue
South Dakota Achieve	SD	Developmental Disabilities Clinic/Center	$0	$166.9M
Dakotabilities	SD	Voluntary or Charitable Agency	$0	$77.8M
Sanford Medical Center	SD	Family Medicine Physician	$0	$68.8M
Volunteers Of America, Dakotas	SD	Intellectual and/or Developmental Disabilities Residential Treatment Facility	$0	$60.9M
Southeastern Behavioral Healthcare	SD	Mental Health Clinic/Center (Including Community Mental Health Center)	$0	$59.1M
Resouces For Human Development, Inc.	SD	Intellectual and/or Developmental Disabilities Community Based Residential Treatment Facility	$0	$31.1M
Sanford Medical Center	SD	General Acute Care Hospital	$0	$24.4M
Childrens Dental Center	SD	Pediatric Dentistry	$0	$24M
Sanford Medical Center	SD	Air Ambulance	$0	$11.9M
Avera Mckennan	SD	Family Medicine Physician	$0	$10.6M

Gregory Nissen — Billing Profile & Reimbursement Data

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Key Findings

Medicare: Total Revenue Breakdown by CPT/HCPCS Code

Medicare: Complete Services Breakdown

Medicare: Competitive Analysis & Benchmarks

Related Providers

Nearby Providers

Frequently Asked Questions

References