可以

Healthcare.gov上似乎說AOS pending的都可以：

Applicants for any of these statuses qualify to use the Marketplace:

Adjustment to LPR Status

仔細看法規，關於Obamacare的lawfully present定義，45 CFR 155.20說：

"Lawfully present" has the meaning given the term in § 152.2.

跟著45 CFR 152.2列出各種算lawfully present的情況。其中包括

(4)(vii) Aliens whose visa petitions have been approved and who have a pending application for adjustment of status;

既然你的I-526批了，如果你有I-485 pending你應該符合這個。另外有一項

(4)(iii) Aliens who have been granted employment authorization under 8 CFR 274a.12(c)(9), (10), (16), (18), (20), (22), or (24);

拿到I-485 EAD（就是C9類型EAD）之後，無論petition有沒有批都可以符合這個。