PHI Small health plan PHI PHI Implementation specification PHI Business associate Health maintenance organization (HMO) Group health plan PHI Modify or modification PHI 45 CFR § 160.103 Health care clearinghouse State Transaction Individually identifiable health information Person 45 CFR § 160.103 Health care provider Health care PHI Health insurance issuer PHI Standard PHI PHI Secretary Act Use PHI PHI Covered Entities Compliance date Covered entity Organized health care arrangement HHS Employer Protected health information Electronic media Disclosure Health plan Workforce ANSI PHI PHI Privacy Rule Health information Electronic protected health information 45 CFR § 160.103 PHI EIN hcfa Individual PHI PHI