haau3 FHIR Implementation Guide (HFIG) - Local Development build (v1.0.0) built by the FHIR (HL7® FHIR® Standard) Build Tools. See the Directory of published versions
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According to AARP's 2025 Caregiving Report, roughly one in four Americans (63 million) is a family caregiver in America. A dramatic increase of 45% since 2015. These family caregivers, thereafter just caregivers for short, are family, friends, and children that come from all racial, ethnic, and socioeconomic backgrounds. These caregivers assist with activities of daily living (ADL) like bathing, dressing, and feeding, but also instrumental activities of daily living (IADL) like managing finances and coordinating transportation. 59 million reportedly are caring for adults aged 18 or older and 4 million are caring for children under age 18 with an illness or disability.
For caregivers, balancing their caregiving duties with work is a challenge. Seven in ten are are gainfully employed, but half report experiencing some work disruption that include arriving late, leaving early, or taking time off to care for their loved ones. Working caregivers also report experiencing more isolation (25%), taking on more debt (22%), using up short-term savings (31%), or late to paying their bills or leaving them unpaid (19%).
The AARP report reveals a growing population of caregivers that are strained, under-supported, and often invisible. However, it also provides a comprehensive look into the state of caregiving in the US to enable our nation to form better economic, financial, and health policies to support our nation's caregivers and the individuals they care for.
Purpose
Haau3 is a FHIR-native, AI-powered companion to help caregivers focus on the human side of care by automating as much of the administrative burden as possible.
Scope
The haau3 FHIR Implementation Guide (HFIG) is designed to solve the interoperability problems that generate many of the administrative burdens that caregivers face. The scope will focus on caregiver and patient-mediated use cases with a priority on the following key areas:
Centralization of all healthcare data into a single, user-friendly app
Use AI to automate administrative tasks and guide caregivers towards effective resources
Bidirectional sharing of data between patients & caregivers and healthcare entities
This implementation guide and the underlying FHIR Specification are licensed as public domain under the FHIR license. Further, this guide includes examples making use of terminologies such as LOINC, SNOMED CT and others that have more restrictive licensing requirements. Implementers should make themselves familiar with licensing and any other constraints of terminologies and other components used as part of their implementation process.
This publication includes IP covered under the following statements.
Centers for Medicare & Medicaid Services. (2025). 2026 Health Insurance Exchange Public Use Files (Benefits and Cost Sharing PUF) [Data file and code book]. Retrieved from http://www.cms.gov/CCIIO/Resources/Data-Resources/marketplace-puf.html. Benefit names reproduced verbatim. CMS does not endorse haau3 or this guide.
Codes and labels from the Plan Benefit Package (PBP) Benefits 2027 data dictionary (PBP_Benefits_2027_dictionary.xlsx, in https://www.cms.gov/files/zip/pbp-benefits-2027.zip), published by the Centers for Medicare & Medicaid Services, a work of the U.S. Government. Each label is the dictionary's own with its leading code removed. CMS does not endorse haau3 or this guide.
Most of the information on the CDC and ATSDR websites is not subject to copyright, is in the public domain, and may be freely used or reproduced without obtaining copyright permission. For information and exceptions regarding use of CDC material please see https://www.cdc.gov/other/agencymaterials.html
The UCUM codes, UCUM table (regardless of format), and UCUM Specification are copyright 1999-2009, Regenstrief Institute, Inc. and the Unified Codes for Units of Measures (UCUM) Organization. All rights reserved. https://ucum.org/trac/wiki/TermsOfUse
This material contains content that is copyright of SNOMED International. Implementers of these specifications must have the appropriate SNOMED CT Affiliate license - for more information contact https://www.snomed.org/get-snomed or info@snomed.org.
Using RxNorm codes of type SAB=RXNORM as this specification describes does not require a UMLS license. Access to the full set of RxNorm definitions, and/or additional use of other RxNorm structures and information requires a UMLS license. The use of RxNorm in this specification is pursuant to HL7's status as a licensee of the NLM UMLS. HL7's license does not convey the right to use RxNorm to any users of this specification; implementers must acquire a license to use RxNorm in their own right.
