Resources / Calendar

ACO Calendar

Key dates for voluntary alignment, beneficiary notification letters, health data reporting, and MSSP beneficiary notices.

LEAD Calendar ↓ REACH Calendar ↓ MSSP Calendar ↓

Voluntary Alignment

LEAD SVA Submission Calendar

For LEAD (Long-term Enhanced ACO Design) ACOs participating in Hybrid alignment, below are the PY 2027 SVA submission deadlines and effective alignment dates.

Performance Year	Submission Deadline (by 11:59 PM ET)	Beneficiaries Effective Alignment Date
PY 2027	October 23, 2026*	January 1, 2027
PY 2027	December 15, 2026	February 1, 2027
PY 2027	January 15, 2027	March 1, 2027
PY 2027	February 15, 2027	April 1, 2027
PY 2027	March 15, 2027	May 1, 2027
PY 2027	April 15, 2027	June 1, 2027
PY 2027	May 14, 2027	July 1, 2027
PY 2027	June 15, 2027	August 1, 2027
PY 2027	July 15, 2027	September 1, 2027
PY 2027	August 13, 2027	October 1, 2027
PY 2027	September 15, 2027	November 1, 2027
PY 2027	October 15, 2027	December 1, 2027

*Beneficiaries aligned via the October 23, 2026 submission will not be included in the Preliminary Benchmark Report, but will be effective January 1, 2027 and included in the December Aggregate Alignment Estimate.

Voluntary Alignment

ACO REACH SVA Calendar

Voluntary Alignment quarters are slightly shifted from calendar quarters — they're tied to CMS submission dates.

26Q1

Submission day is 2/11/26. Quarter runs 10/23/25 to 2/11/26.

26Q2

Submission day is 5/13/26. Quarter runs 2/12/26 to 5/13/26.

26Q3

Submission day is 8/12/26. Quarter runs 5/14/26 to 8/12/26.

26Q4

Submission day is 10/23/26. Quarter runs 8/13/26 to 10/23/26 (a shorter window that varies year to year).

Week	Key Activities	26Q1	26Q2	26Q3	26Q4
0	Start of New SVA Quarter	10/23/25	2/12/26	5/14/26	8/13/26
2–4	Patient Lists Due for SVA Campaigns	12/19/25	3/11/26	6/10/26	9/1/26
5–6	SVA Campaigns Launch	12/27/25	3/17/26	6/18/26	9/8/26
8	Upload 4i Files (BAR, Provider Alignment Report, SVA Response File, ACO Participants List)	1/31/26	4/30/26	7/31/26	10/31/26
11	"SVAs Awaiting Information" Due to Mabel + Last Call for In-Clinic Forms	2/7/26	5/9/26	8/8/26	10/19/26
12	CMS Submission Day	2/11/26	5/13/26	8/12/26	10/23/26
—	Alignment Effective Date	4/1/26	7/1/26	10/1/26	1/1/27

Notifications

Beneficiary Notification Letter (BNL) Calendar

Q1 & Q2 Aligned Members

CMS deadline: May 30
Emails sent: May 4
Letters mailed: May 11 (in-home ~May 21)

Q3 Aligned Members

CMS deadline: Sept 30
Emails sent: Aug 11
Letters mailed: Aug 18 (in-home ~Aug 28)

Q4 Aligned Members

CMS deadline: Nov 28
Emails sent: Nov 6
Letters mailed: Nov 13 (in-home ~Nov 23)

Managing undelivered mail

For step-by-step instructions on resolving undeliverable BNLs, see our BNL guide.

Upstream Drivers of Health

SDoH Calendar

January

PY26 in-clinic surveys distributed
PY25 SDoH processing continues

February

Mid-Feb: Mabel creates preliminary SDoH target list based on Jan BAR file
Feb 20: Last call for PY25 SDoH exports / in-clinic surveys
Late-Feb: PY25 SDoH QC

March

Early March: Mabel shares PY25 SDoH submission template
Early March: preliminary PY26 SDoH target list based on Jan BAR file
Early March: PY26 SDoH Dashboard available
March 13: PY25 SDoH submission deadline

April–October

Mabel processes PY26 SDoH in-clinic surveys and exports
(Optional) email campaigns launch

November

Early Nov: updated PY26 SDoH target list based on Oct BAR file
Early Nov: SDoH email campaigns launch
Mid-Nov: SDoH mail campaigns launch

December–March

Mabel processes incoming SDoH responses (see January–March for QC and submission deadline)

MSSP

MSSP Beneficiary Information Notices (BINs)

Initial and follow-up notices sent to newly aligned members each quarter.

Quarter	ACO-MS Files Available	Initial Notice	Follow-Up Notice
Q0	December–February	ASAP after files available	~45 days following initial notice
Q1	May	ASAP after files available	~45 days following initial notice
Q2	August	ASAP after files available	~45 days following initial notice
Q3	November	ASAP after files available	~45 days following initial notice

If you have any questions, please reach out to your account manager or support@getmabel.com.