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 Armed Forces Pacific for Medicaid) — rank 1 means the highest claims volume for that code.

Why is the Medicaid comparison limited to Armed Forces Pacific 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. Armed Forces Pacific (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.

Sang-wahn Koo (NPI 1083802128)

Field	Value
Entity Type	Individual
Organization	Sang-wahn Koo
Address	Unit 15245 Box Brian
City	Apo
State	AP (Armed Forces Pacific)
ZIP	96271
Taxonomy	Psychiatry Physician
NPI Enumerated	October 12, 2007

Payer Source	Total Paid
Medicare	$6.9K
Medicaid	$0

Key Findings

This provider’s billing is effectively single-payer on file: total Medicare revenue is $6.9K and there is no Medicaid billing on file, indicating no measurable Medicaid participation in the dataset provided. Analysts should treat Medicare as the only public payer exposure for this NPI.

Revenue is highly concentrated in a very small set of services: the precomputed top-3 Medicare codes account for 100.0% of this provider's total Medicare revenue, meaning nearly all reported Medicare dollars come from a limited code mix. This concentration increases sensitivity of Medicare revenue to changes in utilization or reimbursement of those few codes.

The top Medicare codes reflect outpatient psychiatric care with both evaluation/management and psychotherapy components. Code 99214 (E/M for established patients, moderate decision making or 30+ minutes) generated $4.4K from 59 claims at $74 avg paid/claim (63.4% of Medicare revenue), and add-on psychotherapy 90833 generated $2.5K from 56 claims at $45 avg paid/claim (36.6% of Medicare revenue). Together these codes imply sessions that combine medication management and brief psychotherapy in office-based visits.

Claim-level activity shows roughly comparable volume between the E/M base code and the psychotherapy add-on: 59 claims for 99214 versus 56 claims for 90833, with per-claim payments of $74 and $45 respectively. This mix suggests a practice pattern where many visits include both an evaluation/management component and an add-on psychotherapy element.

National competitive standing on the top codes is modest: 99214 ranks #318378 of 479517 providers nationally (33th percentile; typical, unremarkable volume for this code) and 90833 ranks #5181 of 7842 providers nationally (33th percentile; typical, unremarkable volume for this code). These ranks indicate the provider is not a dominant national participant for either code and operates at a common volume level relative to peers.

The NPI has a long tenure in the registry (enumerated 2007-10-12, ~19 years ago), which signals a sustained presence in the market even though current Medicare billing is limited. Tenure can be useful when cross-referencing historical claims patterns or affiliations in longer-term analyses.

Despite the presence of psychotherapy services, total reported Medicare revenue is small ($6.9K), implying low absolute Medicare throughput or a limited Medicare patient panel. Combined with no Medicaid billing on file, this provider’s public-payer footprint appears narrow, so analysts should look to commercial payers or non-billed services if assessing overall practice scale or revenue sources.

Medicare: Complete Services Breakdown

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

2 rows

CPT/HCPCS Code	Description	Claims	Avg Paid	Revenue
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…	60	$70	$4.4K
90833	In this add–on service, the provider performs psychotherapy, a series of techniques for treating the psychiatric disorders of the patient, in addition to an evaluation and management service in the…	60	$50	$2.5K

Medicare: Competitive Analysis & Benchmarks

How this provider's Medicare billing volume and revenue compare to other providers nationally and within its state, across 2 CPT/HCPCS codes. Note: this provider's state, "AP," is a US military postal designation for Armed Forces stationed in the Asia-Pacific region — not a traditional US state; the State panel below benchmarks against other providers coded under the same designation.

View: State1 / 2

Claims Volume vs. Armed Forces Pacific Distribution

Sang-wahn Koo — 0 of 2 codes billed far more than typical (above p95)

p5–p95 (all providers)p25–p75MedianThis providerOutlier

Rank Distribution — Armed Forces Pacific

Full comparison — all codes billed, vs. state median

2 rows

CPT/HCPCS Code	Rank	Provider Count	Median Claims	Avg Paid	Average Revenue
99214	9	20	60	$80	$9.1K
90833	2	10	80	$50	$3.9K

Nearby Providers

Other providers in the same ZIP code as Sang-wahn Koo, ranked by combined Medicare and Medicaid revenue.

Provider	State	Taxonomy	Medicare Revenue	Medicaid Revenue
Joon Park	AP (Armed Forces Pacific)	Dentist	$0	$623.9K
Seong Cho-ju	AP (Armed Forces Pacific)	Clinical Social Worker	$0	$195K
Dennis Chung	AP (Armed Forces Pacific)	General Practice Dentistry	$0	$51.7K
Hannah Choi	AP (Armed Forces Pacific)	Family Medicine Physician	$7.6K	$38.6K
Doris Nieves	AP (Armed Forces Pacific)	Physical Therapist	$4.2K	$0
Timothy Gocke	AP (Armed Forces Pacific)	Internal Medicine Physician	$3.2K	$0
Il-gyu Cho	AP (Armed Forces Pacific)	Child & Adolescent Psychiatry Physician	$2.8K	$0
Steve Huynh	AP (Armed Forces Pacific)	Optometrist	$0	$1.8K
Hyun Shim	AP (Armed Forces Pacific)	Clinical Social Worker	$1K	$0

Sang-wahn Koo — Billing Profile & Reimbursement Data

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Sang-wahn Koo — 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

Nearby Providers

Frequently Asked Questions

References