Being a concerned citizen pays – $10,000 to be exact. That’s what COP SHOT – an organization that offers a reward for information leading to the arrest and conviction of anyone who shoots a city cop – paid one informant yesterday.

The recipient gave investigators the name and whereabouts of Isaac Lopez, 24, who wounded off-duty Officer Juan Medina in Brooklyn on Oct. 19, 2003.

The tipster’s call to (800) COP SHOT led police to arrest Lopez at his Norwich, Conn., home a few days later. Lopez was sentenced to four years in prison for the attack.

MANHATTAN

*** Police are offering a $2,000 reward for information leading to the capture of an ex-con wanted in a string of Manhattan ATM heists last month.

Jerome Collins (above) first struck at 12:30 a.m. on March 5, when he approached a woman at an ATM in the Washington Mutual Bank on Broadway near West 12th Street, police said.

He allegedly told her he had a gun, but never produced one. He made her withdraw $500 from the ATM, then fled with the cash, police said.

On March 19, he allegedly confronted another woman at the same location, repeated the act and fled with the same amount of cash. He then struck twice on March 24, at an ATM in a Fleet branch on Delancey Street and a Chase bank on Third Avenue, police said. In those cases, he allegedly stole $20 and $100 from women.

*** Cops yesterday released surveillance photos of a note-passing thief being sought in connection with four bank hold-ups in Manhattan.

The unidentified man (above) began his spree at 2:45 p.m. on March 26, when he walked into a Commerce branch on Fifth Avenue near East 15th Street. He handed a note to a teller and was given cash, then fled.

He struck next at about 2 p.m. on April 9 in another Commerce branch, on Fifth Avenue and 27th Street, where he repeated the routine and fled with loot. He robbed the same bank on April 24, about five hours after he hit another Commerce branch, on East 26th Street.

*** A patient and a construction worker suffered minor injuries yesterday in a freak accident at Memorial Sloan-Kettering Cancer Center, cops and witnesses said.

The worker was on a flatbed truck unloading a 20-foot metal stud outside the hospital on East 67th Street, where he is helping build a housing unit for an operating room.

He accidentally swung the stud into the street, spearing the passenger-side door of a gold Chevrolet minivan and shattering the window.

Patient Ruth Laboy, who was in the passenger#=cm EQ=#s seat, suffered a nick to her face from the flying glass in the 11:45 a.m. accident. The worker fell back and suffered three gashes to his thigh. (m)

BROOKLYN

*** A bat-and-pipe wielding teen attacked his ex-girlfriend and her boyfriend in separate incidents, authorities said yesterday.

Eliezer Colon, 19, confronted former girlfriend Vanessa Thornton, 19, and Hayro Perez, also 19, on Nichols Avenue near Etna Street in Cypress Hills at 9 p.m. on April 6.

Colon allegedly brandished a pipe and swung it at Thornton, hitting her in the head and causing a minor injury. Colon fled, police said, but returned to the same location at 12:30 a.m. on April 16.

Wielding a bat this time, he smashed Perez with the weapon, breaking his wrist, cops said.

Perez was taken to Jamaica Hospital, where he received 12 stitches and was released. Colon was charged with assault, menacing and weapon possession after he surrendered to police at the 75th Precinct on Tuesday.

*** An East Flatbush man assisted police in the arrest of a man who had robbed him using a sharp object, authorities said yesterday. Rollin Jean, 38, got off a bus at Clarendon Road and East 28th Street at 3:30 a.m. Monday, when a man, identified by authorities as Gonas Paul, 35, approached him from behind.

The robber demanded money, put a sharp object to Jean’s back, and snatched $20 before fleeing, police said.

Jean called 911, cornered the suspect in a back yard and waited for cops to arrive. Police found Paul hiding out and arrested him.

*** A Fort Greene man beat his girlfriend with a with a frying pan after he told her he was too tired to have sex, authorities said yesterday.

Derick Simmons fought with Tawanda Jones in her Dumont Avenue apartment in Brownsville at 10:40 p.m. on April 19.

Simmons socked Jones in the face, then picked up a frying pan and smashed her in the head, cops said.

Jones, 30, was treated for minor injuries at the scene and released. Simmons, of Clifton Place, surrendered to police at the 73rd Precinct.

*** A 28-year-old man was shot in the leg yesterday in Williamsburg street. He was on Moore Street near Bushwick Avenue at 7:30 p.m. when a gunman opened fire and fled.

The victim was taken to Brooklyn Hospital in stable condition.

QUEENS

*** A black man found a racial slur scrawled on his car in Jackson Heights yesterday, and cops are investigating it as a bias incident.

The vandalism was discovered on a window of the car on 76th Street and 35th Avenue.

STATEN ISLAND

*** A man who exposed himself and masturbated in front of a woman and two teens in separate incidents at bus stops has been arrested, authorities said yesterday.

Jason Alfonso, 21, surrendered to police Monday and was charged with public lewdness and harassment.

Alfonso allegedly exposed himself around 8 a.m. on March 26 to a 50-year-old woman at a bus stop on Chestnut Avenue and Bay Street. He allegedly exposed himself and masturbated before driving off.

Alfonso struck again on April 11 and April 18 , police said, when he exposed himself to a 17-year-old girl at two Clove Road bus stops.