| I-CAN (International Child Amputee Network) | |
| I-CAN (International Child Amputee Network) - Amputation / Limb Deficiency | |
IC | |
| ICAN, Inc. (International Cesarean Awareness Network) | |
| ICAN, Inc. (International Cesarean Awareness Network) - Cesarean Birth | |
| Ichthyosis | |
ID | |
| IDEAS (IsoDicentric 15 Exchange, Advocacy and Support) | |
| IDEAS (IsoDicentric 15 Exchange, Advocacy and Support) - Inverted Duplication 15 | |
| Idiopathic Thrombocytopenic Purpura | |
IM | |
| Immigrant Helpline | |
| Immune Deficiency | |
| Immune Deficiency Foundation | |
| Immune Deficiency Foundation - Immune Deficiency | |
| Immune Deficiency Helpine | |
| Impotence | |
| Impotence Information Center | |
| Impotence Information Center - Impotence | |
IN | |
| In Need Of Diagnosis, Inc. (INOD) | |
| In Need Of Diagnosis, Inc. (INOD) - Undiagnosed Illness | |
| Incest Resources, Inc. | |
| Incest Resources, Inc. - Sexual Abuse / Incest / Rape | |
| Incest Survivors Anonymous (I.S.A.) | |
| Incest Survivors Anonymous (I.S.A.) - Sexual Abuse / Incest / Rape | |
| Incontinence | |
| Incontinence Helpline | |
| Incontinence Information Center | |
| Incontinence Information Center - Incontinence Helpline |  Top |
| Incontinentia Pigmenti | |
| Incontinentia Pigmenti International Foundation | |
| Incontinentia Pigmenti International Foundation - Incontinentia Pigmenti | |
| Indoor Air Quality Information Clearinghouse | |
| Indoor Air Quality Information Clearinghouse - Environmental Helpline | |
| Infantile Spasms List | |
| Infantile Spasms List - Aicardi Syndrome / Infantile Spasms | |
| Infectious Illness, general | |
| Infertility / Childlessness | |
| Inflammatory Bowel Disease/Irritable Bowel Synd. | |
| Information and Referral Centre of Greater Montreal | |
| Information and Referral Centre of Greater Montreal - Clearinghouse - Canada | |
| Institute for Human Services/HELPLINE | |
| Institute for Human Services/HELPLINE - Clearinghouse - New York | |
| Insurance Helpline | |
| Insurance Information Institute | |
| Insurance Information Institute - Insurance Helpline | |
| Intercongregational Addictions Program (ICAP) | |
| Intercongregational Addictions Program (ICAP) | |
| Intercongregational Addictions Program (ICAP) | |
| Intercongregational Addictions Program (ICAP) | |
| Intercongregational Addictions Program (ICAP) | |
| Intercongregational Addictions Program (ICAP) - Alcohol Abuse | |
| Intercongregational Addictions Program (ICAP) - Debt / Overspending | |
| Intercongregational Addictions Program (ICAP) - Drug Abuse | Top |
| Intercongregational Addictions Program (ICAP) - Gambling | |
| Intercongregational Addictions Program (ICAP) - Overweight | |
| International Advocate for Glycoprotein Storage Disease (ISMRD) | |
| International Advocate for Glycoprotein Storage Disease (ISMRD) - Mannosidosis, Alpha | |
| International Association for Clear Thinking | |
| International Association for Clear Thinking - Mental Health (General) | |
| International Association for Near-Death Studies | |
| International Association for Near-Death Studies - Near Death Experience | |
| International Association of Laryngectomees | |
| International Association of Laryngectomees - Laryngectomy | |
| International Costello Syndrome Support Group | |
| International Costello Syndrome Support Group - Costello Syndrome | |
| International Council on Infertility Information Dissemination (INCIID) | |
| International Council on Infertility Information Dissemination (INCIID) - Infertility / Childlessnes | |
| International Doctors in Alcoholics Anonymous | |
| International Doctors in Alcoholics Anonymous | |
| International Doctors in Alcoholics Anonymous - Addictions | |
| International Doctors in Alcoholics Anonymous - Alcohol Abuse | |
| International Doctors in Alcoholics Anonymous - Drug Abuse | |
| International Dyslexia Association | |
| International Dyslexia Association - Dyslexia / Learning Disabilities Helpline | |
| International Essential Tremor Foundation | |
| International Essential Tremor Foundation - Essential Tremor | |
| International Fibrodysplasia Ossificans Progressiva Association | |
| International Fibrodysplasia Ossificans Progressiva Association - Fibrodysplasia Ossificans Progress | Top |
| International Foundation for Functional Gastrointestinal Disorders | |
| International Foundation for Functional Gastrointestinal Disorders - Inflammatory Bowel Disease/Irri | |
| International Foundation for Gender Education | |
| International Foundation for Gender Education - Sexual Orientation / Gay and Lesbian | |
| International Foundation for Stutterers, Inc. | |
| International Foundation for Stutterers, Inc. - Speech / Stuttering | |
| International Joseph Diseases Foundation, Inc. | |
| International Lawyers in Alcoholics Anonymous | |
| International Lawyers in Alcoholics Anonymous | |
| International Lawyers in Alcoholics Anonymous - Addictions | |
| International Lawyers in Alcoholics Anonymous - Alcohol Abuse | |
| International Lawyers in Alcoholics Anonymous - Drug Abuse | |
| International Ministers and Pastors in Recovery | |
| International Ministers and Pastors in Recovery - Drug Abuse | |
| International Myeloma Foundation | |
| International Myeloma Foundation | |
| International Myeloma Foundation | |
| International Myeloma Foundation - Cancer | |
| International Myeloma Foundation - Cancer Helpline | |
| International Myeloma Foundation - Multiple Myeloma | |
| International Nurses Anonymous | |
| International Nurses Anonymous | |
| International Nurses Anonymous - Alcohol Abuse | |
| International Nurses Anonymous - Drug Abuse | |
| International Paruresis Association, Inc. | Top |
| International Paruresis Association, Inc. - Anxiety Attacks / Phobias / Agoraphobia | |
| International Pemphigus Foundation | |
| International Pemphigus Foundation - Pemphigus / Hailey Hailey | |
| International Pharmacists Anonymous - Addictions | |
| International Premature Ovarian Foundation | |
| International Premature Ovarian Foundation - Women's Health | |
| International Rett Syndrome Foundation | |
| International Rett Syndrome Foundation - Rett Syndrome | |
| International Ventilator Users Network | |
| International Ventilator Users Network - Ventilator Users | |
| International WAGR Syndrome Association | |
| International WAGR Syndrome Association - WAGR Syndrome | |
| International Waldenstrom's Macroglobulinemia Foundation | |
| International Waldenstrom's Macroglobulinemia Foundation - Waldenstrom's Macroglobulinemia | |
| Interstitial Cystitis | |
| Interstitial Cystitis Association | |
| Interstitial Cystitis Association - Interstitial Cystitis | |
| Intestinal Multiple Polyposis | |
| Intestinal Multiple Polyposis and Colorectal Cancer (IMPACC) | |
| Intestinal Multiple Polyposis and Colorectal Cancer (IMPACC) | |
| Intestinal Multiple Polyposis and Colorectal Cancer (IMPACC) - Cancer | |
| Intestinal Multiple Polyposis and Colorectal Cancer (IMPACC) - Intestinal Multiple Polyposis | |
| Inverted Duplication 15 | |
IR | |
| Irish Medical Directory - Patient Support Organizations | |
| Iron Overload Diseases Association, Inc. | Top |
| Iron Overload Diseases Association, Inc. - Hemochromatosis | |
| Irritable Bowel Syndrome Self Help and Support Group | |
| Irritable Bowel Syndrome Self Help and Support Group - Inflammatory Bowel Disease/Irritable Bowel Sy | |
| IRS Federal Tax Information | |
| IRS Federal Tax Information - Tax Info Helpline | |
IS | |
| Israel Self-Help Center | |
| Israel Self-Help Center - Clearinghouse - Israel | |
IT | |
| It's My Heart | |
| It's My Heart - Heart Disease | |
IV | |
| iVillage Health Message Boards | |
| iVillage Health Message Boards - Women's Health | |
