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Mass General Brigham (formerly AllWays Health Partners)
Mass General Brigham (formerly AllWays Health Partners) is a health insurer. They report 470 insurance plans covering 2.3M providers across 160K billing codes.
Source: public Transparency in Coverage filesRefreshed monthly, latest September 202618 monthly releases tracked
Monthly release
470
Plans
XX% vs prior month
2.3M
Providers (NPIs)
XX% vs prior month
590K
Tax IDs
XX% vs prior month
160K
Billing codes
XX% vs prior month
730M
Rate rows
XX% vs prior month
September 2026 release
What's in Mass General Brigham (formerly AllWays Health Partners)'s data
A profile of the machine-readable files Mass General Brigham (formerly AllWays Health Partners) publishes, after PayerPrice parses and normalizes them.
Billing code types
Distinct codes and rate rows by code system
CodesRows
- CPT19K650M88%
- HCPCS48K47M6.5%
- ICD92K31M4.3%
- CDT1.7K6.5M0.9%
- APR-DRG350320K<0.1%
- RC770160K<0.1%
- MS-DRG770140K<0.1%
- EAPG47063K<0.1%
- CSTM-ALL115K<0.1%
- LOCAL55<0.1%
Billing class
Professional vs. institutional rate rows
- Professional590M80%
- Institutional140M20%
Negotiation arrangement
How each rate is expressed
- Negotiated510M69%
- Fee Schedule120M17%
- Derived62M8.4%
- Per Diem30M4.1%
- Percentage9.8M1.3%
Plan identifiers
HIOS IDs mark individual and small-group plans; EINs mark employer plans
- EIN470100%
Providers by type
Distinct NPIs by entity type
- Individual (Type 1)2M87%
- Organization (Type 2)300K13%
Tax IDs by type
How provider groups are identified
- EIN450K76%
- NPI (Individual)140K24%
- NPI (Organization)100<0.1%
Top states
States with the most providers in network
- California200K
- Texas170K
- New York150K
- Florida140K
- Pennsylvania100K
- Ohio94K
Top specialties
Provider taxonomies with the most NPIs
- Family Nurse Practitioner140K
- Clinical Social Worker130K
- Family Medicine Physician110K
- Physician Assistant110K
- Internal Medicine Physician100K
- Mental Health Counselor80K
These are the files. Want the rates inside them?
Look up Mass General Brigham (formerly AllWays Health Partners)'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 |
|---|---|---|---|---|---|
| September 2026 | 470 | 2.3M | 590K | 160K | 730M |
| August 2026 | 460 | 2.3M | 590K | 48K | 1.4B |
| July 2026 | 450 | 2.3M | 590K | 48K | 1.4B |
| June 2026 | — | — | — | — | |
| May 2026 | — | — | — | — |
Data quality scorecard
4/6Acceptable
This payer scores 4/6 on data quality (Acceptable). Areas that don't meet the threshold: valid tax ids and hios plan.
Evaluated on the September 2026 release.
Professional & Institutional Rates
Data includes both professional and institutional billing class rates
Valid Tax IDs
Less 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.
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Mass General Brigham (formerly AllWays Health Partners)'s negotiated rates, in the tools your team already uses
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Frequently asked questions
About Mass General Brigham (formerly AllWays Health Partners)'s price transparency data.
What price transparency data does Mass General Brigham (formerly AllWays Health Partners) publish?
Mass General Brigham (formerly AllWays Health Partners)'s September 2026 Transparency in Coverage files list 470 plans, 2.3M providers (NPIs), 590K tax IDs and 160K billing codes, for 730M negotiated rate rows in total.
Which states does Mass General Brigham (formerly AllWays Health Partners)'s network cover?
Mass General Brigham (formerly AllWays Health Partners)'s files include providers in 51 states. The states with the most in-network providers are California, Texas, New York, Florida, Pennsylvania.
How often is Mass General Brigham (formerly AllWays Health Partners)'s data updated?
Payers must post updated machine-readable files every month. PayerPrice processes Mass General Brigham (formerly AllWays Health Partners)'s files monthly; the latest processed release is September 2026, and 18 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 Mass General Brigham (formerly AllWays Health Partners)'s negotiated rates?
Start a free PayerPrice trial to search Mass General Brigham (formerly AllWays Health Partners)'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.