---
type: "Bill"
title: "Health Insurance – Coverage for Mental Health Benefits and Substance Use Disorder Benefits – Treatment Criteria"
description: "Health Insurance – Coverage for Mental Health Benefits and Substance Use Disorder Benefits – Treatment Criteria"
jurisdiction: "us/states/md"
legislature: "Maryland General Assembly"
session: "2019"
identifier: "HB 599"
citation: "Maryland HB 599 (2019)"
classification: ["bill"]
subjects: ["Insurance - Health", "Committees and Commissions", "Health Insurance", "Insurance", "Mental and Behavioral Health", "Patients", "Reports"]
status: "enacted"
primary_sponsors: ["Kelly and Hill"]
version_count: 1
action_count: 13
vote_count: 2
first_action: "2019-02-06"
last_action: "2019-04-30"
source: "openstates"
source_identifier: "ocd-bill/e579054f-907c-4cdc-ab26-83a17c0c976e"
source_url: "http://mgaleg.maryland.gov/webmga/frmMain.aspx?id=HB599&stab=01&pid=billpage&tab=subject3&ys=2019rs"
source_hash: "d946ad8c35d6b841cf698bd8d96c503edaff96ed2ba184e1a72736a72fd62e67"
vintage: "2026-07-01"
source_snapshot: "https://data.openstates.org/daily/2026-07-01/public.pgdump"
retrieved_at: "2026-07-06"
confidence: "reported"
tags: ["legislation", "bill", "us-md"]
---

# Maryland HB 599 (2019) — Health Insurance – Coverage for Mental Health Benefits and Substance Use Disorder Benefits – Treatment Criteria

## Version chain

The bill's text revisions, in order — the diff chain from filing to enrollment.

1. **Bill Text** (committee substitute) — [source](http://mgaleg.maryland.gov/2019RS/bills/hb/hb0599f.pdf)

## Votes

- On Third Reading — **47–0** (pass) · upper
- On Third Reading — **138–0** (pass) · lower

## Sponsors

- Kelly and Hill — primary (person)

## Timeline

The legislative action history — every referral, reading, and vote.

- **2019-02-06** First Reading Health and Government Operations `referral-committee`
- **2019-02-13** Hearing 2/28 at 1:00 p.m.
- **2019-03-14** Favorable with Amendments Report by Health and Government Operations `committee-passage-favorable`
- **2019-03-14** Favorable with Amendments {576284/1 Report Adopted `committee-passage-favorable`
- **2019-03-14** Second Reading Passed with Amendments
- **2019-03-15** Third Reading Passed (138-0) `passage`
- **2019-03-18** First Reading Finance `referral-committee`
- **2019-03-25** Favorable Report by Finance `committee-passage-favorable`
- **2019-03-27** Favorable Report Adopted `committee-passage-favorable`
- **2019-03-27** Second Reading Passed
- **2019-03-28** Third Reading Passed (47-0) `passage`
- **2019-03-29** Returned Passed
- **2019-04-30** Approved by the Governor - Chapter 358 `executive-signature`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/e579054f-907c-4cdc-ab26-83a17c0c976e`. Confidence: reported (aggregated from official Maryland legislature records).