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InterWest Health
InterWest Health is a health insurer. They report 1 insurance plans covering 23K providers across 19K billing codes.
Source: public Transparency in Coverage filesRefreshed monthly, latest July 202612 monthly releases tracked
Monthly release
1
Plans
23K
Providers (NPIs)
2.9K
Tax IDs
19K
Billing codes
850K
Rate rows
July 2026 release
What's in InterWest Health's data
A profile of the machine-readable files InterWest Health publishes, after PayerPrice parses and normalizes them.
Billing code types
Distinct codes and rate rows by code system
CodesRows
- CPT11K560K66%
- HCPCS7K260K31%
- CDT77029K3.4%
- CSTM-ALL195<0.1%
Billing class
Professional vs. institutional rate rows
- Both850K100%
Negotiation arrangement
How each rate is expressed
- Negotiated850K100%
- Percentage95<0.1%
Plan identifiers
HIOS IDs mark individual and small-group plans; EINs mark employer plans
- EIN1100%
Providers by type
Distinct NPIs by entity type
- Individual (Type 1)22K96%
- Organization (Type 2)9804.3%
Tax IDs by type
How provider groups are identified
- EIN2.9K100%
Top states
States with the most providers in network
- Montana7.3K
- Washington4.5K
- Idaho1.9K
- North Dakota1.5K
- Wyoming1.3K
- Colorado510
Top specialties
Provider taxonomies with the most NPIs
- Family Medicine Physician1.4K
- Family Nurse Practitioner1.4K
- Physician Assistant1.4K
- Physical Therapist1.3K
- Diagnostic Radiology Physician880
- Internal Medicine Physician820
These are the files. Want the rates inside them?
Look up InterWest Health's negotiated rates by provider, TIN, billing code and plan.
Month-over-month history
Track how network size and rate volume change with each monthly release.
| Month | Plans | NPIs | Tax IDs | Billing codes | Rate rows |
|---|---|---|---|---|---|
| July 2026 | 1 | 23K | 2.9K | 19K | 850K |
| June 2026 | 1 | 0 | 0 | 0 | 0 |
| May 2026 | 1 | 0 | 0 | 0 | 0 |
| April 2026 | — | — | — | — | |
| March 2026 | — | — | — | — |
Data quality scorecard
4/6Acceptable
This payer scores 4/6 on data quality (Acceptable). Areas that don't meet the threshold: professional & institutional rates and hios plan.
Evaluated on the July 2026 release.
Professional & Institutional Rates
Data is missing professional and/or institutional billing class rates
Valid Tax IDs
More than 80% of Tax IDs are EIN or NPI (Organization) type
HIOS Plan
Data does not include any HIOS-identified plans
Low Derived/Percentage Rates
Less than 10% of negotiation entries are derived or percentage type
Standard Code Coverage
Sufficient CPT and HCPCS code coverage with low proportion of LOCAL entries
Common Taxonomies
NPIs in the dataset cover at least 50 distinct provider taxonomies
How the score works
Each monthly release is checked against six criteria. 5–6 passing criteria rate Good, 3–4 rate Acceptable, and 0–2 rate Poor.
Behavioral, RX, and other specialty networks may not pass all criteria but can still contain complete and usable data.
Access the data
InterWest Health's negotiated rates, in the tools your team already uses
PayerPrice turns raw transparency files into one clean, normalized dataset across 180+ payers, refreshed every month. Pick how you want to work with it.
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Pull negotiated rates, providers and benchmarks into your own products and pipelines.
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Query the full normalized dataset with SQL or PySpark, shared directly into your warehouse.
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MCP server
Ask Claude, Cursor or your own agents questions like "What does InterWest Health pay for CPT 99213 near me?"
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Frequently asked questions
About InterWest Health's price transparency data.
What price transparency data does InterWest Health publish?
InterWest Health's July 2026 Transparency in Coverage files list 1 plans, 23K providers (NPIs), 2.9K tax IDs and 19K billing codes, for 850K negotiated rate rows in total.
Which states does InterWest Health's network cover?
InterWest Health's files include providers in 51 states. The states with the most in-network providers are Montana, Washington, Idaho, North Dakota, Wyoming.
How often is InterWest Health's data updated?
Payers must post updated machine-readable files every month. PayerPrice processes InterWest Health's files monthly; the latest processed release is July 2026, and 12 monthly releases are available.
What is the Transparency in Coverage rule?
Since July 2022, the federal Transparency in Coverage rule has required most group health plans and health insurers to publish machine-readable files of their in-network negotiated rates and out-of-network allowed amounts, updated monthly. These files are the source for the data on this page.
How can I access InterWest Health's negotiated rates?
Start a free PayerPrice trial to search InterWest Health's rates in the web app, or book a demo to get the full dataset through the REST API, SQL in Snowflake or Databricks, or AI assistants through the PayerPrice MCP server.