Data User Workgroup

Overview

Data User Workgroup meetings answer questions specific to CHIA’s APCD and Case Mix data, clarify content, and enable sharing of information, tools, and methodologies.

Meetings are usually held the fourth Tuesday of each month from 3-4 p.m.

Join the CHIA Data User Workgroup mailing list to receive email notifications and agenda items for these webinars.

Data User Workgroup (July)

Tuesday, July 21, 2026

3:00 PM – 4:00 PM (ET)

Previous Meeting Materials

Meeting Date	Data User Support Questions
Tuesday, January 27, 2026 (PDF)	Neglect or Abandonment Capitated Claims Denied Claims Inpatient Medications National Emergency Medical Services Information System (NEMSIS) Case Definitions
Tuesday, February 24, 2026 (PDF)	Departure Status Coding Joint Replacements Dental Claims Insurance Type Code Products
Tuesday, March 24, 2026 (PDF)	CHIA’s New Online Application for Data Occupational Data Outpatient Surgery Pediatric Interfacility Transfers Costs and Charges
Tuesday, April 28, 2026 (PDF)	MA APCD Data Size Revisited Alzheimer’s Disease Payer Categories in Case Mix and MA APCD Out-of-State Health Care
Tuesday, May 26, 2026	FY2025 HIDD Availability MA APCD Gobeille Impact Reminder Case Mix MEID Sequence Carrier License Type
Tuesday, June 23, 2026	Email questions and suggestions for upcoming meetings to apcd.data@chiamass.gov or casemix.data@chiamass.gov
Tuesday, July 28, 2026
Tuesday, August 25, 2026
Tuesday, September 22, 2026
Tuesday, October 27, 2026
Tuesday, November 24, 2026
Tuesday, December 22, 2026



Tuesday, January 28, 2025 Presentation (PDF) Data User Support Questions Use of Level 3 MA APCD Medical Claims Admission Date Anomalies Hospital Inpatient Discharge Data Duplicate Associate Diagnosis Codes GLP-1 Receptor Agonists for Obesity Status of Vision Carriers Comparison of Self-Insured Trends by Release Outpatient Emergency Department Services	Tuesday, February 25, 2025 Presentation (PDF) Data User Support Questions CPT and HCPCS codes for AI-enabled medical devices and diagnostic services Member Link EIDs for Behavioral Health Care Transitions Payer Source Code for Medicare HMO Products	Tuesday, March 28, 2025 Presentation (PDF) Data User Support Questions Health Care Facility Bed Counts Designating External Linkage Fields MA APCD Currency Fields Interfacility Transfers Revisited

Tuesday, April 22, 2025 Presentation (PDF) Data User Support Questions Master Patient Index Data Exclusion Diabetes-Related Data Gambling Diagnosis Codes	Tuesday, May 27, 2025 Presentation (PDF) Data User Support Questions Decrease in Inpatient Procedures for Obesity Patterns of Social Life Disruption Coding Safety Device Coding for Traumatic Injuries Shift in Inpatient Special Charges	Tuesday, June 24, 2025 Presentation (PDF) Data User Support Questions Product File Deductibles Substance Use Disorder Filter Frequency Update to Fatal and Injury Reporting System Tool (FIRST) Education Level Added to Interactive CDC WONDER Death Data

Tuesday, July 22, 2025 Presentation (PDF) Behavioral Health Provider Type Classifications Cardiac PET Scans Injuries Related to an Encounter with a Marine Animal	Tuesday, August 26, 2025 Presentation (PDF) Radiology and Advanced Imaging Data Selection of Geospatial Data Primary Care Flag Fields Null Values Classifications	Tuesday, September 23, 2025 Presentation (PDF) Specialty and Retail Clinics Oral Cancer in Dental Claims vs. Medical Claims Patterns of Weekend Care MemberMDM IDs for Case Mix

Tuesday, October 28, 2025 Presentation Neonate/Infant data Importing the MA APCD Out of state data Robotic Procedures	Tuesday, November 25, 2025 Presentation High alignment of MA APCD Medicare Advantage Codes with CMS enrollment counts MA APCD, Case Mix, and CDC Wonder deaths by care setting Wellness and Fitness claims Bundled Payments	Tuesday, December 23, 2025 Presentation (Available soon) Mapping Sites of Service and Facility Types in the Massachusetts APCD Admission Source Codes and Transfer Pathways Historical Hospital Volume: Trends and Variability CHIA Data in Action: A Year in Review


Tuesday, January 23, 2024 Presentation (PDF) \| PPT Data User Support Questions ICD-10-CM Updates to Granularity in Cannabis Diagnosis Codes Inpatient Accommodations Coding Specific Fields to Use when Consolidating MA APCD Releases Expected Distribution of Diagnosis and Procedure Codes	Tuesday, February 27, 2024 Presentation (PDF) \| PPT Data User Support Questions MemberLinkEIDs Type of Bill on Facility Claims Duplicate Data ED Volume in Case Mix Data and Hospital Profile Reports Behavioral Health Hospitals Alcohol-Related Disorders Gobeille Impact on Latest Release MA APCD and Case Mix Payer Type Comparison	Tuesday, March 26, 2024 Presentation (PDF) \| PPT Data User Support Questions Number of Files in a given MA APCD Subscription Size of a Data Extract Size of the Largest File Data Format Inpatient Psychiatric Facilities Currency Fields Provider Location

Tuesday, May 28, 2024 Presentation (PDF) \| PPT Data User Support Questions Target Dates for Case Mix Data Availability Cost of Data Application § Transfer Variable Case Mix Dataset Identifying Transfer and Treatment Hospitals in Case Mix Diagnosis and Procedure Codes in Case Mix Deep Dive into Present on Admission Indicators The Impact of Gobeille on Pharmacy and Dental Claims	Tuesday, June 25, 2024 Presentation (PDF) \| PPT Data User Support Questions Site of Service for Prison/Correctional Facility Healthcare Doulas Insect Activity and Climate Change	Tuesday, July 23, 2024 Presentation (PDF) \| PPT Diagnosis Code Counts in CHIA data Estimated Time for Non-government Organization Application Buy-up of National Provider Identifier (NPI) Longitudinal Population Counts in MA APCD Quality of ED Flag Field Variation in the Use of “Unknown” Race Category Updates to ICD-10-CM

Tuesday, September 24, 2024 Presentation (PDF) \| PPT Consolidation Strategies for Insurance Type Product Codes across Medical, Pharmacy, and Dental Claims Analyzing Colonoscopy Care Settings in Case Mix and MA APCD Grouping Outpatient Hospital Claims Breast Reconstruction Surgery using MA APCD	Tuesday, October 22, 2024 Presentation (PDF) \| PPT Race and Ethnicity variables Government versus non-government applications Contents of the HIDD, EDD and the OOD Groupers in the MA APCD? Member and Subscriber Relationship Codes Psychiatric Care Settings in MA APCD Procedure Code Modifiers for Emergency Care	Tuesday, November 26, 2024 Presentation (PDF) \| PPT Zoonotic Diseases and Injuries MassHealth Claim Type Record Linkage Revisited Derived Fields


Tuesday, January 25, 2023 Presentation (PDF) \| PPT Data User Support Questions Case Mix and MA APCD Comparison of Bariatric Surgery Case Mix and MA APCD Comparison of Arrival via Ambulance Case Mix and MA APCD Comparison of COVID-19 Diagnosis CDC WONDER addition of Massachusetts 2021 Death Data	Tuesday, February 28, 2023 Presentation (PDF) \| PPT Data User Support Questions The use of occurrence codes to determine place of injury risk The completeness of Unique Identifiers in case mix data before and after the pandemic	Tuesday, March 28, 2023 Presentation (PDF) \| PPT Data User Support Questions Primary Care Providers Filtering for Accepting New Patients Provider Specialty Search Tools Pharmacy Claims Date Fields

Tuesday, April 25, 2023 Presentation (PDF) \| PPT Data User Support Questions Hospital Recorded Blood Alcohol Levels ICD-10-Codes for Family and Social Disruption Comparison of Case Mix to MA APCD Hospital Identifiers	Tuesday, July 25, 2023 Presentation (PDF) \| PPT Data User Support Questions Urgent Care Centers Data Integration ED Visit Volume Newborns	Tuesday, December 5, 2023 Presentation (PDF) \| PPT Data User Support Questions Mortality Data Suicide and Homicide Ideation Procedure Code Modifiers Gender Data Accuracy Medicaid HSN Indicator


MA APCD Tuesday, October 25, 2022 Meeting cancelled	Case Mix Tuesday, November 22, 2022 Presentation (PDF) \| PPT
MA APCD Tuesday, August 23, 2022 Presentation (PDF) \| PPT	Case Mix Tuesday, September 27, 2022 Meeting cancelled
MA APCD Tuesday, June 28, 2022 Presentation (PDF) \| PPT	Case Mix Tuesday, July 26, 2022 Presentation (PDF) \| PPT
MA APCD Tuesday, April 26, 2022 Meeting cancelled	Case Mix Tuesday, May 24, 2022 Presentation (PDF) \| PPT
MA APCD Tuesday, February 15, 2022 Presentation (PDF) \| PPT	Case Mix Tuesday, March 22, 2022 Presentation (PDF) \| PPT

User Support Materials

Linking Claims Data to Member Eligibility ZIP Code Data (March 2023)

Claims Linkage to ME One ZIP Code per Year Table (PDF)

Additional Tutorials

The Demographic Impact of Gobeille – August 2020 (PDF)

ICD 9 to ICD 10 Changes – Sept 2017 (PDF)

What DRG versions are available in CHIA Inpatient Case Mix Data? (PDF)

How to Count Patients Admitted from the ED in the HDD File (PDF)

Resultant Research Using CHIA Data

Browse published research studies that used the Massachusetts All Payer Claims Database or CHIA's case mix data, organized by topic and publication date.

MA APCD

Learn about the Massachusetts All Payer Claims Database, including what data is collected, how to request access, and how to submit claims data to CHIA.

Case Mix

Access Massachusetts hospital case mix data, including inpatient discharge, emergency department, and outpatient observation datasets, documentation, and data specification manuals.


Tuesday, January 23, 2024 Presentation (PDF) \| PPT Data User Support Questions ICD-10-CM Updates to Granularity in Cannabis Diagnosis Codes Inpatient Accommodations Coding Specific Fields to Use when Consolidating MA APCD Releases Expected Distribution of Diagnosis and Procedure Codes	Tuesday, February 27, 2024 Presentation (PDF) \| PPT Data User Support Questions MemberLinkEIDs Type of Bill on Facility Claims Duplicate Data ED Volume in Case Mix Data and Hospital Profile Reports Behavioral Health Hospitals Alcohol-Related Disorders Gobeille Impact on Latest Release MA APCD and Case Mix Payer Type Comparison	Tuesday, March 26, 2024 Presentation (PDF) \| PPT Data User Support Questions Number of Files in a given MA APCD Subscription Size of a Data Extract Size of the Largest File Data Format Inpatient Psychiatric Facilities Currency Fields Provider Location

Tuesday, May 28, 2024 Presentation (PDF) \| PPT Data User Support Questions Target Dates for Case Mix Data Availability Cost of Data Application § Transfer Variable Case Mix Dataset Identifying Transfer and Treatment Hospitals in Case Mix Diagnosis and Procedure Codes in Case Mix Deep Dive into Present on Admission Indicators The Impact of Gobeille on Pharmacy and Dental Claims	Tuesday, June 25, 2024 Presentation (PDF) \| PPT Data User Support Questions Site of Service for Prison/Correctional Facility Healthcare Doulas Insect Activity and Climate Change	Tuesday, July 23, 2024 Presentation (PDF) \| PPT Diagnosis Code Counts in CHIA data Estimated Time for Non-government Organization Application Buy-up of National Provider Identifier (NPI) Longitudinal Population Counts in MA APCD Quality of ED Flag Field Variation in the Use of “Unknown” Race Category Updates to ICD-10-CM

Tuesday, September 24, 2024 Presentation (PDF) \| PPT Consolidation Strategies for Insurance Type Product Codes across Medical, Pharmacy, and Dental Claims Analyzing Colonoscopy Care Settings in Case Mix and MA APCD Grouping Outpatient Hospital Claims Breast Reconstruction Surgery using MA APCD	Tuesday, October 22, 2024 Presentation (PDF) \| PPT Race and Ethnicity variables Government versus non-government applications Contents of the HIDD, EDD and the OOD Groupers in the MA APCD? Member and Subscriber Relationship Codes Psychiatric Care Settings in MA APCD Procedure Code Modifiers for Emergency Care	Tuesday, November 26, 2024 Presentation (PDF) \| PPT Zoonotic Diseases and Injuries MassHealth Claim Type Record Linkage Revisited Derived Fields


Tuesday, January 25, 2023 Presentation (PDF) \| PPT Data User Support Questions Case Mix and MA APCD Comparison of Bariatric Surgery Case Mix and MA APCD Comparison of Arrival via Ambulance Case Mix and MA APCD Comparison of COVID-19 Diagnosis CDC WONDER addition of Massachusetts 2021 Death Data	Tuesday, February 28, 2023 Presentation (PDF) \| PPT Data User Support Questions The use of occurrence codes to determine place of injury risk The completeness of Unique Identifiers in case mix data before and after the pandemic	Tuesday, March 28, 2023 Presentation (PDF) \| PPT Data User Support Questions Primary Care Providers Filtering for Accepting New Patients Provider Specialty Search Tools Pharmacy Claims Date Fields

Tuesday, April 25, 2023 Presentation (PDF) \| PPT Data User Support Questions Hospital Recorded Blood Alcohol Levels ICD-10-Codes for Family and Social Disruption Comparison of Case Mix to MA APCD Hospital Identifiers	Tuesday, July 25, 2023 Presentation (PDF) \| PPT Data User Support Questions Urgent Care Centers Data Integration ED Visit Volume Newborns	Tuesday, December 5, 2023 Presentation (PDF) \| PPT Data User Support Questions Mortality Data Suicide and Homicide Ideation Procedure Code Modifiers Gender Data Accuracy Medicaid HSN Indicator


MA APCD Tuesday, October 25, 2022 Meeting cancelled	Case Mix Tuesday, November 22, 2022 Presentation (PDF) \| PPT
MA APCD Tuesday, August 23, 2022 Presentation (PDF) \| PPT	Case Mix Tuesday, September 27, 2022 Meeting cancelled
MA APCD Tuesday, June 28, 2022 Presentation (PDF) \| PPT	Case Mix Tuesday, July 26, 2022 Presentation (PDF) \| PPT
MA APCD Tuesday, April 26, 2022 Meeting cancelled	Case Mix Tuesday, May 24, 2022 Presentation (PDF) \| PPT
MA APCD Tuesday, February 15, 2022 Presentation (PDF) \| PPT	Case Mix Tuesday, March 22, 2022 Presentation (PDF) \| PPT